BEST PRACTICE Impulse and Momentum

The graph shows a force applied to an object with respect to time. What is the impulse (in newton-second) delivered to the object between 1 and 2 seconds? Express the answer as a whole number. No need to write the units.

The brakes of a car applied an average force of 5.0 × 10³ N for 2.0 s to slow it down. What impulse does the brakes deliver to a car?

• 1.0 × 10³ N∙s

• 2.5 × 10³ N∙s

• 2.5 × 10⁴ N∙s

• 1.0 × 10⁴ N∙s

A compact car, with mass 725 kg, is moving at 115 km/h toward the east. What is the magnitude of its momentum?

• 8.34 × 10⁴ kg∙m/s

• 8.34 × 10⁷ kg∙m/s

• 2.32 × 10⁴ kg∙m/s

• 2.32 × 10¹ kg∙m/s

A snow mobile, of mass 240 kg, speeds up from 6.00 m/s to 28.0 m/s over a time interval of 60.0 s. What is the change in momentum of the car in kg-m/s? Express the answer as a whole number. No need to write the units.

A snow mobile, of mass 240 kg, speeds up from 6.00 m/s to 28.0 m/s over a time interval of 60.0 s. How much force (in newtons) did the engine exert on the car? Express the answer as a whole number. No need to write the units.

An objects momentum versus velocity graph is shown. What is the the mass of the object in kg? Express the answer in 2 significant figures. No need to write the unit.

An object's momentum versus velocity graph is shown. What is the impulse (in N-s) on the object as it moves from 4 m/s to 8 m/s? Express the answer as a whole number. No need to write the units.

Rank the magnitude of the change in momentum during a 10-second interval for each box.

• A = B > C> D

• D > A = B > C

• D > C > A = B

• C > A = B > D

Rank the magnitude of the impulse given to these carts.

• A > B > C > D

• A < B < C < D

• A = B = C = D

• A = B > C = D

A 0.174-kg softball is pitched horizontally at 26.0 m/s. After it is hit by the bat, the ball moves in the opposite direction at 38.0 m/s. What is the magnitude of the change in momentum of the ball?

• 11.1 kg∙m/s

• 8.57 kg∙m/s

• 12.0 kg∙m/s

• 49.2 kg∙m/s