11. A change in momentum is caused by:
A) Impulse
B) Energy
C) Power
D) Velocity
12. The SI unit of momentum is:
A) kg·m²/s²
B) kg·m/s
C) N·m
D) J/s
13. An object moving in a circular path at constant speed experiences:
A) No acceleration
B) Radial acceleration
C) Constant velocity
D) Linear motion
14. Centripetal force acts:
A) Tangent to the motion
B) Away from the center
C) Toward the center
D) Opposite to motion
15. If no external force acts on a system, the total momentum of the system is:
A) Zero
B) Increasing
C) Constant
D) Decreasing
16. The work done when force and displacement are perpendicular is:
A) Maximum
B) Minimum
C) Zero
D) Negative
17. Kinetic energy is given by:
A) ½mv²
B) mgd
C) mgh
D) mv
18. The unit of work in the SI system is:
A) Watt
B) Joule
C) Newton
D) Pascal
19. Power is defined as:
A) Work done × Time
B) Work done ÷ Time
C) Force × Distance
D) Force ÷ Time
20. The unit of power is:
A) Newton
B) Joule
C) Watt
D) Pascal