Unit 3.4 - Momentum and Impulse

Front

What is momentum?

Back

Momentum is the product of an object's mass and its velocity, represented by the formula p = mv, where p is momentum, m is mass, and v is velocity.

Front

What is impulse?

Back

Impulse is the change in momentum of an object when a force is applied over a period of time, represented by the formula J = FΔt, where J is impulse, F is force, and Δt is the time duration.

Front

How is momentum conserved in a closed system?

Back

In a closed system, the total momentum before an event (like a collision) is equal to the total momentum after the event, assuming no external forces act on the system.

Front

What is the relationship between impulse and momentum?

Back

Impulse is equal to the change in momentum of an object. This is expressed as J = Δp, where J is impulse and Δp is the change in momentum.

Front

What is the formula for calculating force using momentum?

Back

Force can be calculated using the formula F = Δp/Δt, where F is force, Δp is the change in momentum, and Δt is the time over which the change occurs.

Front

What is an elastic collision?

Back

An elastic collision is a type of collision where both momentum and kinetic energy are conserved.

Front

What is a perfectly inelastic collision?

Back

A perfectly inelastic collision is a type of collision where momentum is conserved, but kinetic energy is not; the colliding objects stick together after the collision.

Front

What does the variable J represent in physics?

Back

In physics, the variable J represents impulse.

Front

How does an airbag reduce the force experienced by a driver?

Back

An airbag reduces the force experienced by a driver by extending the time of impact, which decreases the force according to the impulse-momentum theorem.

Front

What is the formula for momentum?

Back

The formula for momentum is p = mv, where p is momentum, m is mass, and v is velocity.