7.2 Impulse

Front

What is impulse?

Back

Impulse is the product of the average force applied to an object and the time duration over which the force is applied. It is equal to the change in momentum of the object.

Front

What is the relationship between impulse and momentum?

Back

Impulse is equal to the change in momentum of an object.

Front

What is the formula for impulse?

Back

J = F * t, where J is impulse, F is the average force, and t is the time duration.

Front

How does collision time affect impulse?

Back

A longer collision time results in a smaller average force for the same impulse, reducing the risk of injury.

Front

What is the unit of impulse?

Back

The unit of impulse is Newton-seconds (N·s) or kg·m/s.

Front

If a car comes to a stop, what happens to its momentum?

Back

The momentum of the car decreases to zero.

Front

What is the impulse experienced by a 60 kg person who goes from 40 m/s to 0 m/s?

Back

The impulse is 2400 kg·m/s.

Front

What is the net force required to stop a 40 kg mass moving at 5 m/s in 8 seconds?

Back

The net force required is 25 N.

Front

What does the equation J = Ft represent?

Back

This equation represents the impulse-momentum theorem, stating that impulse (J) is equal to the product of force (F) and time (t).

Front

What happens to impulse if the force is doubled while keeping the time constant?

Back

If the force is doubled, the impulse will also double.