Musings of the Sundarman

Physics 101 Kinematics Questions and Answers

1. True or false: Law of Kinematics is applicable for bodies executing 2 dimensional motion.
Answer: False! It is applied for 1 D motion only.

2. Fill in the blank: There are ____ laws of motion prescribed by Newton.
Answer: 3

3. For determining instantaneous velocity, which technique of calculus is used?
a) Integration
b) Differentiation
c) Limits
d) Range

Answer: C

4. What is the difference between speed and velocity?

Answer: Speed has only magnitude while velocity has both magnitude & direction.

5. How can a body have zero acceleration but a non zero velocity?
Answer: It can happen when a body is moving with uniform velocity.

6. How can a body have zero velocity but a non zero acceleration?
Answer: It can happen just when a body comes to rest from motion.

7. A ball is thrown up in the sky with a velocity of 20 m/s. It reaches the highest point in 3 s after which it starts to fall. Calculate this highest point’s height from the point from where the ball was thrown. Take g = 10 m/s^2.
Answer:
Height = 0.5 (20+0) * 3 = 30 m

8. True or false: In the expression V = u + g.t, g represents grams
Answer: False!

9. True or False: The value of g is constant throughout the earth.
Answer: False!

10. True or false: Slope is always a unit-less number.
Answer: False

11. Fill in the blank: Average speed is the ratio of total distance & total ____
Answer: Time

12. When x is displacement and t is time, dx/dt gives:
a) Velocity
b) Acceleration
c) Retardation
d) Displacement
Answer: A

13. The size of a particle is ________
Answer: Infinitesimal

14. True or False: A particle always has zero mass
Answer: False

15. Fill in the blank: Classical mechanics is also called as _______
Answer: Kinematics

16. Rate of change in velocity is called as:
a) Displacement
b) Speed
c) Acceleration
d) None of these
Answer: C

17. Rate of change in position is called __________
Answer: Displacement

18. Why to calculate velocity or acceleration we differentiate with respect to time?
Answer: To get the rate of change.

19. Change in displacement when the time is infinitesimally small is called _________
Answer: Instantaneous velocity.