What is friction and friction force ?

What is friction and friction force ?
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Friction and friction force: When an object tries to move or move from one object to another in contact, an obstacle arises against the motion of the two objects , this obstacle is called friction. And this barrier force is called friction force. The force of friction always acts in the opposite direction of motion. Friction always hinders motion.
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Related questions

Why friction force is not a conservation force ?

Description : Why friction force is not a conservation force ?

Last Answer : If an object starts its journey from a point and turns in a certain direction and then returns to the same point. This is possible in the case of gravitational forces and electric balls. This ... force of friction is not zero. Rather negative. For this reason friction force is not forest protection.

Normal force acting per unit cross sectional area is called A. weight B. pressure C. volume D. friction

Description : Normal force acting per unit cross sectional area is called A. weight B. pressure C. volume D. friction

Last Answer : pressure

Normal force exerted per unit area by gas on walls of container is A. temperature B. energy C. pressure D. friction

Description : Normal force exerted per unit area by gas on walls of container is A. temperature B. energy C. pressure D. friction

Last Answer : pressure

Pair of forces that cause steering wheel of a car to rotate is called A. couple B. friction C. normal force D. weight

Description :  Pair of forces that cause steering wheel of a car to rotate is called A. couple B. friction C. normal force D. weight

Last Answer : couple

Incorrect statement for co-efficient of friction could be that A. The coefficient of friction is denoted by the Greek letter µ. B. The coefficient of friction is directly proportional to the force of friction C. The coefficient of friction is constant even in the conditions of fast slipping and high contact pressure D. The coefficient of friction is inversely proportional to the force pressing the surfaces together

Description : Incorrect statement for co-efficient of friction could be that A. The coefficient of friction is denoted by the Greek letter µ. B. The coefficient of friction is directly proportional to ... D. The coefficient of friction is inversely proportional to the force pressing the surfaces together

Last Answer : The coefficient of friction is constant even in the conditions of fast slipping and high contact pressure

Kinetic friction is always A. lesser than static friction B. greater than static friction C. equal to static friction D. equal to contact force

Description : Kinetic friction is always A. lesser than static friction B. greater than static friction C. equal to static friction D. equal to contact force

Last Answer : lesser than static friction

Only force acting on a bouncing ball is A. gravity B. weight of ball C. friction D. a and b both

Description : Only force acting on a bouncing ball is A. gravity B. weight of ball C. friction D. a and b both

Last Answer : a and b both

Carlos is pulling a 40 kilogram cart with a horizontal force of 100 newtons. The force of friction on the cart is 20 newtons. The acceleration of the cart is: w) 2 meters per second squared x) 2.5 meters per second squared y) 20 meters per second squared z) 200 meters per second squared

Description : Carlos is pulling a 40 kilogram cart with a horizontal force of 100 newtons. The force of friction on the cart is 20 newtons. The acceleration of the cart is: w) 2 meters per second squared x) 2.5 meters per second squared y) 20 meters per second squared z) 200 meters per second squared

Last Answer : ANSWER: W -- 2 METERS PER SECOND SQUARED

The work done by a friction force is: w) always positive x) always negative y) always zero z) either positive or negative depending upon the situation.

Description : The work done by a friction force is: w) always positive x) always negative y) always zero z) either positive or negative depending upon the situation. 

Last Answer : ANSWER: X -- ALWAYS NEGATIVE

Can someone explain to me what's the thing with surface normal and friction force?

Description : Can someone explain to me what's the thing with surface normal and friction force?

Last Answer : Force normal is the force facing upwards, perpendicular to the object. It is what prevents you from falling down when sitting on a chair. Frictional force can be in any direction depending on context. Imagine a ... are having trouble with? At this point, your Q what's the thing is rather vague.

The angle of friction is a.The angle which frictional force makes with the normal b.The anle at which the force applied from external souce will cause movement c.The angle at which fictional force is inclined to external force d.The angle between the normal reaction and the resultant of normal reaction and the limiting friction e.None of the above

Description : The angle of friction is a.The angle which frictional force makes with the normal b.The anle at which the force applied from external souce will cause movement c.The angle at which fictional ... the normal reaction and the resultant of normal reaction and the limiting friction e.None of the above

Last Answer : d. The angle between the normal reaction and the resultant of normal reaction and the limiting friction

A uniform cylinder of weight W is rolling while slipping on a rough horizontal surface under the influence of a horizontal force. The force of friction between the cylinder and the surface is a.Proportional to the coefficient of static friction b.Proportional to the coefficient of dynamic friction c.Indeterminate d.Determinate but depends on the acceleration of the cylinder e.None of the above

Description : A uniform cylinder of weight W is rolling while slipping on a rough horizontal surface under the influence of a horizontal force. The force of friction between the cylinder and the surface is a. ... c.Indeterminate d.Determinate but depends on the acceleration of the cylinder e.None of the above

Last Answer : c. Indeterminate

Kinetic friction is a.Maximum value of frictional force when a body is about to move b.Friction between two well lubricated bodies c.Friction force acting when the body is in motion d.Driction force which keeps a body in motion e.None of the above

Description : Kinetic friction is a.Maximum value of frictional force when a body is about to move b.Friction between two well lubricated bodies c.Friction force acting when the body is in motion d.Driction force which keeps a body in motion e.None of the above

Last Answer : c. Friction force acting when the body is in motion

If the angle of friction is zero a body will experience a.Infinite friction b.Zero friction c.The force of friction will act normal to the plane d.The force of friction will act in the direction of motion e.None of the above

Description : If the angle of friction is zero a body will experience a.Infinite friction b.Zero friction c.The force of friction will act normal to the plane d.The force of friction will act in the direction of motion e.None of the above

Last Answer : b. Zero friction

Which one of the following is not the law of dry friction? a.If friction is neglected, the reactions are always normal to the surfaces on contact b.Friction always acts to oppose the relative motion of the free body c.If static friction is acting, the value of the friction force may vary from zero to its maximum value d.The force of friction is always normal to the surface e.All of the above

Description : Which one of the following is not the law of dry friction? a.If friction is neglected, the reactions are always normal to the surfaces on contact b.Friction always acts to oppose the relative motion of ... its maximum value d.The force of friction is always normal to the surface e.All of the above

Last Answer : d. The force of friction is always normal to the surface

A body of weight 100 kg is placed on a horizontal plane. A horizontal force of 30 kg is applied and the block is just on the point of motion. The angle of friction is a.About 16? b.30? c.45? d.60? e.None of the above

Description : A body of weight 100 kg is placed on a horizontal plane. A horizontal force of 30 kg is applied and the block is just on the point of motion. The angle of friction is a.About 16? b.30? c.45? d.60? e.None of the above

Last Answer : a. About 16?

A uniform cylinder of weight W is rolling while slipping on a rough horizontal surface under the influence of a horizontal force. The force of friction between the cylinder and the surface is a.Indeterminate b.Proportional to the coefficient of dynamic friction c.Determinate but depends on the acceleration of the cylinder d.107 dynes e.Proportional to the coefficient of static friction

Description : A uniform cylinder of weight W is rolling while slipping on a rough horizontal surface under the influence of a horizontal force. The force of friction between the cylinder and the surface is a. ... on the acceleration of the cylinder d.107 dynes e.Proportional to the coefficient of static friction

Last Answer : c. Determinate but depends on the acceleration of the cylinder

The maximum frictional force which comes into play when a body just begins to slide over the surface of another body is known as a.Kinetic friction b.Rolling friction c.Dynamic friction d.Limiting friction e.Sliding friction

Description : The maximum frictional force which comes into play when a body just begins to slide over the surface of another body is known as a.Kinetic friction b.Rolling friction c.Dynamic friction d.Limiting friction e.Sliding friction

Last Answer : d. Limiting friction

The coefficient of friction is a.The tangent of the angle between the normal reaction and direction of limiting friction b.The tangent of the angle between the normal reaction and the resultant of the normal reaction and the limiting friction c.The tangent of the angle of the net resultant force with the direction of motion d.The tangent of the angle between the horizontal plane and the resultant force e.The angle between the normal reaction and the resultant of normal reaction and the limiting friction

Description : The coefficient of friction is a.The tangent of the angle between the normal reaction and direction of limiting friction b.The tangent of the angle between the normal reaction and the resultant ... e.The angle between the normal reaction and the resultant of normal reaction and the limiting friction

Last Answer : a. The tangent of the angle between the normal reaction and direction of limiting friction

A jet of water of cross-sectional area 20 sq. cm impinges on a plate at an angle of 60? with a velocity of 10 m/sec. Neglecting the friction between the jet and plate (density of water 1000/9.81 kgm-1 sec2 per cubic meter), the force exerted by the jet on the plate would be in the range a.15 - 20 kg b.20 - 25 kg c.5 - 10 kg d.25 - 30 kg e.10 - 15 kg

Description : A jet of water of cross-sectional area 20 sq. cm impinges on a plate at an angle of 60? with a velocity of 10 m/sec. Neglecting the friction between the jet and plate (density of water 1000/9.81 kgm-1 sec2 per cubic meter), the ... a.15 - 20 kg b.20 - 25 kg c.5 - 10 kg d.25 - 30 kg e.10 - 15 kg

Last Answer : a. 15 - 20 kg

Which of the following is scalar quantity a.Area of triangle b.Displacement of a particle c.Acceleration of car d.Force of friction e.Velocity a gear

Description : Which of the following is scalar quantity a.Area of triangle b.Displacement of a particle c.Acceleration of car d.Force of friction e.Velocity a gear

Last Answer : a. Area of triangle

The limiting force of fiction is a.The friction force acting on a body when it is in motion b.The value of friction force which stops the movement of the body c.The value of friction force which cannot exceed under a situation d.The friction force acting when the body is just about to move e.Double of the normal friction

Description : The limiting force of fiction is a.The friction force acting on a body when it is in motion b.The value of friction force which stops the movement of the body c.The value of friction force which ... d.The friction force acting when the body is just about to move e.Double of the normal friction

Last Answer : d. The friction force acting when the body is just about to move

A weight of 4.9 N rests on a rough horizontal floor that has a coefficient of friction of 0.5. If g = 9.8 m/s2, the smallest horizontal force that gives the weight an acceleration of 4m/s2 is most nearly a.2.5 N b.3 N c.2 N d.4.5 N e.4.9 N

Description : A weight of 4.9 N rests on a rough horizontal floor that has a coefficient of friction of 0.5. If g = 9.8 m/s2, the smallest horizontal force that gives the weight an acceleration of 4m/s2 is most nearly a.2.5 N b.3 N c.2 N d.4.5 N e.4.9 N

Last Answer : d. 4.5 N

A 20kg toy wagon is pulled with an applied force of 35N. if the handle of the wagon is at 45, and the coefficient of friction is 0.1, find the acceleration of the wagon?

Description : A 20kg toy wagon is pulled with an applied force of 35N. if the handle of the wagon is at 45, and the coefficient of friction is 0.1, find the acceleration of the wagon?

Last Answer : 9.19 m/s^2

What does friction force mean ?

Last Answer : When an object tries to move or move from one object to another, then an obstacle arises against the motion of the two objects , this obstacle is called friction.

Find the friction force due to air on a body of mass 1 kg falling with acceleration `8 m//s^(2)` :-

Description : Find the friction force due to air on a body of mass 1 kg falling with acceleration `8 m//s^(2)` :-

Last Answer : Find the friction force due to air on a body of mass 1 kg falling with acceleration `8 m//s^(2)` :- A. 2 N B. 4 N C. Zero D. None

Why force of static friction is known as ‘self-adjusting force?

Description : Why force of static friction is known as ‘self-adjusting force?

Last Answer : Why force of static friction is known as ‘self-adjusting force?

If the gravity exerts 15 N and there is 10 N of friction how much force will Jim need to exert to move it?

Description : If the gravity exerts 15 N and there is 10 N of friction how much force will Jim need to exert to move it?

Last Answer : Need answer

What happens when friction is equal to the thrust force?

Description : What happens when friction is equal to the thrust force?

Last Answer : In that case, the object won't budge.

What would cause the force of kinetic friction to increase?

Description : What would cause the force of kinetic friction to increase?

Last Answer : an increase in uk (apex)

Which of the following are functions of bearings? a) Ensure free rotation of shaft with minimum friction b) Holding shaft in a correct position c) Transmit the force of the shaft to the frame d) All of the listed

Description : Which of the following are functions of bearings? a) Ensure free rotation of shaft with minimum friction b) Holding shaft in a correct position c) Transmit the force of the shaft to the frame d) All of the listed

Last Answer : d) All of the listed

If 8 bolts are emplaced in a clamp coupling with shaft diameter 80mm d, calculate the tensile force on each bolt if coefficient of friction is 0.3 and torque transmitted is 4000N-m. a) 51234.4N b) 45968.3N c) 41666.7N d) None of the listed

Description : If 8 bolts are emplaced in a clamp coupling with shaft diameter 80mm d, calculate the tensile force on each bolt if coefficient of friction is 0.3 and torque transmitted is 4000N-m. a) 51234.4N b) 45968.3N c) 41666.7N d) None of the listed

Last Answer : c) 41666.7N

In case of clamp coupling, power is transmitted by means of, (A) Friction force (B) Shear resistance (C) Crushing resistance (D) None of the above

Description : In case of clamp coupling, power is transmitted by means of, (A) Friction force (B) Shear resistance (C) Crushing resistance (D) None of the above

Last Answer : (A) Friction force

Which of the following statements is/are true for coulomb damping? 1. Coulomb damping occurs due to friction between two lubricated surfaces2. Damping force is opposite to the direction of motion of vibrating body 3. For smooth surfaces, coefficient of friction depends upon velocity 4. Damping force depends upon the rubbing velocity between two rubbing surfaces a. Only statement 1 b. Statement 2, 3 and statement 4 c. Only statement 2 d. All the above statements are true

Description : Which of the following statements is/are true for coulomb damping? 1. Coulomb damping occurs due to friction between two lubricated surfaces2. Damping force is opposite to the direction of motion of vibrating body ... 2, 3 and statement 4 c. Only statement 2 d. All the above statements are true

Last Answer : c. Only statement 2

Reduction in vibration amplitude after one complete cycle of single degree free vibration with dry friction damping is_____, if where F"= frictional force between mass and surface and k =stiffness of the system. a)4F/k a b) 2f/K C) 3F/k D)8F/k

Description : Reduction in vibration amplitude after one complete cycle of single degree free vibration with dry friction damping is_____, if where F"= frictional force between mass and surface and k =stiffness of the system. a)4F/k a b) 2f/K C) 3F/k D)8F/k

Last Answer : a)4F/k

According to Faraday’s law, EMF stands for a) Electromagnetic field b) Electromagnetic force c) Electromagnetic friction d) Electromotive force

Description : According to Faraday’s law, EMF stands for a) Electromagnetic field b) Electromagnetic force c) Electromagnetic friction d) Electromotive force

Last Answer : d) Electromotive force

Fluidised beds are formed, when the (A) Fluid friction is zero (B) Gravity force is less than the fluid friction (C) Pressure forces equal gravity forces (D) Sum of the fluid friction and pressure forces is equal and opposite to gravity forces

Description : Fluidised beds are formed, when the (A) Fluid friction is zero (B) Gravity force is less than the fluid friction (C) Pressure forces equal gravity forces (D) Sum of the fluid friction and pressure forces is equal and opposite to gravity forces

Last Answer : (B) Gravity force is less than the fluid friction

Frictional force encountered after commencement of motion is called (A) Post friction (B) Limiting friction (C) Kinematic friction (D) Dynamic friction

Description : Frictional force encountered after commencement of motion is called  (A) Post friction  (B) Limiting friction  (C) Kinematic friction  (D) Dynamic friction 

Last Answer : (D) Dynamic friction 

Pick up wrong statement about friction force for dry surfaces. Friction force is (A) Proportional to normal load between the surfaces (B) Dependent on the materials of contact surface (C) Proportional to velocity of sliding (D) Independent of the area of contact surfaces

Description : Pick up wrong statement about friction force for dry surfaces. Friction force is  (A) Proportional to normal load between the surfaces  (B) Dependent on the materials of contact surface  (C) Proportional to velocity of sliding  (D) Independent of the area of contact surfaces 

Last Answer : (C) Proportional to velocity of sliding 

Coefficient of friction is the (A) Angle between normal reaction and the resultant of normal reaction and the limiting friction (B) Ratio of limiting friction and normal reaction (C) The friction force acting when the body is just about to move (D) The friction force acting when the body is in motion

Description : Coefficient of friction is the  (A) Angle between normal reaction and the resultant of normal reaction and the limiting friction  (B) Ratio of limiting friction and normal reaction  (C) The ... body is just about to move  (D) The friction force acting when the body is in motion 

Last Answer : (B) Ratio of limiting friction and normal reaction

Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction (A) Along the plane (B) Horizontally (C) Vertically(D) At an angle equal to the angle of friction to the inclined plane

Description : Least force required to draw a body up the inclined plane is W sin (plane inclination + friction  angle) applied in the direction  (A) Along the plane  (B) Horizontally  (C) Vertically  (D) At an angle equal to the angle of friction to the inclined plane 

Last Answer : (D) At an angle equal to the angle of friction to the inclined plane 

On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be (A) Downwards at its upper end (B) Upwards at its upper end (C) Perpendicular to the wall at its upper end (D) Zero at its upper end

Description : On the ladder resting on the ground and leaning against a smooth vertical wall, the force of  friction will be  (A) Downwards at its upper end  (B) Upwards at its upper end  (C) Perpendicular to the wall at its upper end  (D) Zero at its upper end 

Last Answer : (D) Zero at its upper end 

On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be (A) Towards the wall at its upper end (B) Away from the wall at its upper end (C) Upwards at its upper end (D) Downwards at its upper end

Description : On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be (A) Towards the wall at its upper end (B) Away from the wall at its upper end (C) Upwards at its upper end (D) Downwards at its upper end

Last Answer : (C) Upwards at its upper end

The maximum frictional force which comes into play when a body just begins to slide over another surface is called (A) Limiting friction (B) Sliding friction (C) Rolling friction (D) Kinematic friction

Description : The maximum frictional force which comes into play when a body just begins to slide over another surface is called (A) Limiting friction (B) Sliding friction (C) Rolling friction (D) Kinematic friction

Last Answer : (A) Limiting friction

Kinetic friction is the (A) Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction (B) Ratio of limiting friction and normal reaction (C) The friction force acting when the body is just about to move (D) The friction force acting when the body is in motion

Description : Kinetic friction is the (A) Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction (B) Ratio of limiting friction and normal reaction (C) The friction force ... body is just about to move (D) The friction force acting when the body is in motion

Last Answer : (D) The friction force acting when the body is in motion

Limiting force of friction is the (A) Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction (B) Ratio of limiting friction and normal reaction(C) The friction force acting when the body is just about to move (D) The friction force acting when the body is in motion

Description : Limiting force of friction is the (A) Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction (B) Ratio of limiting friction and normal reaction (C) The friction ... body is just about to move (D) The friction force acting when the body is in motion

Last Answer : (C) The friction force acting when the body is just about to move

Angle of friction is the (A) Angle between normal reaction and the resultant of normal reaction and the limiting friction (B) Ratio of limiting friction and normal reaction (C) The ratio of minimum friction force to the friction force acting when the body is just about to move (D) The ratio of minimum friction force to friction force acting when the body is in motion

Description : Angle of friction is the (A) Angle between normal reaction and the resultant of normal reaction and the limiting friction (B) Ratio of limiting friction and normal reaction (C) The ratio of minimum ... (D) The ratio of minimum friction force to friction force acting when the body is in motion

Last Answer : (A) Angle between normal reaction and the resultant of normal reaction and the limiting friction

Free surface of a liquid tends to contract to the smallest possible area due to force of (A) Surface tension (B) Viscosity (C) Friction (D) Cohesion

Description : Free surface of a liquid tends to contract to the smallest possible area due to force of (A) Surface tension (B) Viscosity (C) Friction (D) Cohesion

Last Answer : Answer: Option A

Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the (A) Force of adhesion (B) Force of cohesion (C) Force of friction (D) Force of diffusion

Description : Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the (A) Force of adhesion (B) Force of cohesion (C) Force of friction (D) Force of diffusion

Last Answer : Answer: Option B