Any change in the velocity of an object results in an acceleration: increasing speed (what people usually mean when they say acceleration), decreasing speed, or changing direction. Yes, that's right, a change in the direction of motion results in an acceleration even if the moving object neither speed up nor slowed down. That's because acceleration depends on the change in velocity and velocity is a vector quantity — one with both magnitude and direction. Thus, a falling apple accelerates, a car stopping at a traffic light accelerates, and the moon in orbit around the Earth accelerates. Acceleration occurs anytime an object's speed increases or decreases, or it changes direction. 1. Acceleration can be defined as rate of change of: a. displacement b. velocity c. momentum d. inertia 2. Acceleration is a vector quantity which indicates that its value: a. can be positive, negative or zero b. is always positive c. is always negative d. is zero 3. A falling apple accelerates: a. negatively and uniformly b. positively and uniformly c. positively and non-uniformly d. negatively and non-uniformly 4. Moon orbiting around the earth because of : a. zero acceleration b. centripetal acceleration c. neutral accelerationd. centrifugal acceleration 5. A car accelerates uniformly from 18 km/h to 36 km/h in 5 minutes. The acceleration is: a. 5ms-2 b. 1 km/s2 c. 216 ms-2 d. 216 km/h2 -------------------------------------------------------------------------------------------------------------------------- More questions to be added shortly...