Motion Worksheet-21

Motion Worksheet-21

 

  1. Displacement can have only + ve value.

 

  1. The acceleration is always directed away from the centre in a uniform circular motion.

 

  1. If the change in velocity in equal intervals of time is not the same, then the object is said to be moving with invariable acceleration.

 

  1. If a body moves with uniform velocity, its acceleration, a = 0.

 

  1. Abody having a uniform velocity will always have a uniform speed.

 

  1. The initial velocity of any freely falling body is  a constant.

 

  1. Total distance travelled/Total time taken = speed

 

  1. A freely falling car has acceleration = 9.8 m/s2

 

  1. A frame of reference is another object of scene with respect to which we can never compare an object’s position.

 

  1. When a body is moving with the effect of gravitational force, the acceleration is sometimes given by  a = g = 9.8 ms–2
  1. In uniform acceleration only, the average velocity is given by,

 

  1. A non uniform motion is also called an accelerated motion.

 

  1. Non uniform velocity can never be = 0

 

  1. When a stone tied to a thread rotated in a circular path with uniform speed is suddenly released, it moves along a straight line that is parallel to the circular path.

 

  1. A body having zero velocity has no acceleration.

 

  1. In a displacement - time graph , the graph can never be perpendicular to time axis.

 

Answer Key:

  1. False

  2. False

  3. False

  4. True

  5. True

  6. True

  7. False

  8. True

  9. False

  10. False

  11. True

  12. True

  13. False

  14. False

  15. False

  16. True