Let’s See Some Examples here
For simplicity sake, all forces (interactions) between objects can be placed into two broad categories: contact forces, and forces resulting from action-at-a-distance. also,
Contact Forces include frictional forces, buoyant forces, normal forces, and air resistance forces…. while,
Action-at-a-distance forces include gravitation, electrostatic and magnetic forces.
Measurement of Force
Force is measured using either the English System of Measurements or the International System of Units (SI). the most Common Units of Force are as following;
—>>SI: Newton (N) 1 N = 0.225 lb;
One Newton (N) of force is defined as the amount of force needed to accede of mass at a rate of 1 meter per second squared (m/s^2).
1 Newton = 1 kg m/sec2 (A kilogram is the amount of weight at which 1 N of force will accelerate at a rate of 1 m/s^2.)
—>>English System: Pound (LB) 1 LB = 4.448 N
In English system of measurements, a slug is the amount of mass that 1 pound of force will accelerate at 1 ft/s^2, and a pound mass is the amount of mass that 1 LB of force will accelerate at 32 feet/s^2.
Description of a Force
A force is a vector quantity. A vector quantity is a quantity which has both magnitude and direction. To fully describe the force acting upon an object, you must describe both its magnitude and direction.
Thus we see, 10 Newtons of force is not a complete description of the force acting on an object. 10 Newtons, downwards is a complete description of the force acting upon an object.