Impulse & Momentum — Practice Quiz

Question 1

A 0.2 kg ball moving at 10 m/s is struck back at 15 m/s. Impulse:

Accepted Answer

5 N·s (opposite direction)

Answer

1 N·s

Answer

−5 N·s

Answer

0.2 N·s

Question 2

Impulse has SI units:

Accepted Answer

N·s (= kg·m/s)

Answer

N/s

Answer

kg·m/s²

Answer

J·s

Question 3

Airbags reduce the force on a passenger during a crash by:

Accepted Answer

Extending the time over which momentum changes ⇒ lower average force

Answer

Reducing the impulse

Answer

Reducing the change in momentum

Answer

Stopping the car

Question 4

Force of 500 N acts for 0.02 s. Impulse:

Accepted Answer

10 N·s

Answer

100 N·s

Answer

0.04 N·s

Answer

25 N·s

Question 5

On an F-t graph, the area equals:

Accepted Answer

Impulse

Answer

Energy

Answer

Power

Answer

Acceleration