Momentum

Momentum of two objects moving with same speed but in opposite direction upon collision is 

A. increased 

B. decreased 

C. is zero 

D. is infinite

Speed of Earth when a rock of mass 60 kg falling towards Earth with speed of 20 m s^-1 is 

A. 2.4 × 10^-22 m s^-1 

B. 3.5 × 10^-33 m s^-1 

C. −2.0 × 10^-22 m s^-1 

D. −3 × 10³⁴ m s^-1

An object travelling with constant velocity has 

A. constant momentum 

B. zero momentum 

C. increasing momentum 

D. decreasing momentum

Interaction that causes an object’s momentum to change is 

A. velocity 

B. acceleration 

C. power 

D. force 

Force exerted by bat on ball if it strikes a ball of mass 0.16 kg initially hits bat with speed of 25 m s^-1 with time impact of 0.003 s is 

A. 145 N 

B. 1333.33 N 

C. 1456.7 N 

D. 6543 N

In a springy collision, if the fast moving trolley collides with a slow one, then the fast one will bounce back at speed of 

A. slow one 

B. less than slow one 

C. more than slow one 

D. with the same speed as before

In a perfectly inelastic collision, kinetic energy 

A. totally disappears 

B. is increased 

C. is decreased 

D. is unchanged 

Resultant force acting on object and rate of change of linear momentum are 

A. inversely related 

B. not related at all 

C. directly related 

D. directly proportional

If the total kinetic energy and momentum of a system becomes zero after collision, then the collision is 

A. elastic 

B. inelastic 

C. conserved 

D. not conserved

In fireworks the momentum provided by chemicals is directed 

A. upwards 

B. left side 

C. right side 

D. downwards