Momentum

Momentum

(excellence) The black ball is initially stationary. Both balls are 0.50 kg. From the diagram, can you calculate the white ball’s initial velocity? (enter answer next slide)

Multiple Choice

The white ball's v_i is :

• 3.2 ms^-1 to the right

• 3.0 ms^-1 to the right

• 2.8 ms^-1 to the right

• 3.5 ms^-1 to the right

Multiple Choice

Calculate the momentum change when a 0.50 kg ball moving at 8.5 ms^-1 is stopped by a goalie.

• 4.25 kgms^-1

• 4.25 kgms^-1 opposite to initial momentum

• 4.25 kgms^-1 same direction as initial momentum

Multiple Choice

A 200g golf ball is whacked at 40ms^-1. The collision lasts 0.0050s.

a) Calculate the momentum change of the ball.

b) Calculate the average force on the ball.

c) Determine the average force on the club.

• a) 8.0 Ns b) 1600 N c) 1600N

• a) 8000 Ns b) 1600 000 N c) 1600 000N

• a) 8.0 Ns b) 160 N c) 160N

• a) 8000 Ns b) 16000 N c) 16000 N

Two rugby players collide in a tackle and stick together as shown. Calculate their final momentum and their final velocity.

(enter your answer next slide)

Multiple Select

The rugby players

• Total p = 500 kg m s^-1 bearing 53^o

• Total p = 500 kg m s^-1 bearing 37^o

• Final v = 2.5 ms^-1 bearing 53^o

• Final v = 2.5 ms^-1 bearing 37^o

(excellence) The black ball is initially stationary. Both balls are 0.50 kg.

Calculate the white ball’s final velocity. (enter next slide)

Multiple Choice

White ball's v_f is:

• 3.2 ms^-1 bearing 65⁰

• 3.0 ms^-1 bearing 65⁰

• 3.0 ms^-1 bearing 55⁰

• 3.2 ms^-1 bearing 55⁰