Momentum & 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, calculated as the product of the average force and the time duration, represented by the formula J = FΔt.

Front

What does the impulse-momentum theorem state?

Back

The impulse-momentum theorem states that the impulse on an object is equal to the change in momentum it causes.

Front

How do you calculate the change in momentum?

Back

The change in momentum can be calculated using the formula Δp = p_final - p_initial, where p_final is the final momentum and p_initial is the initial momentum.

Front

What is the relationship between force, impulse, and time?

Back

Impulse is equal to the average force applied multiplied by the time duration over which the force is applied, represented by the formula J = FΔt.

Front

How do you calculate impulse from a force and time?

Back

Impulse can be calculated using the formula J = FΔt, where J is impulse, F is the average force, and Δt is the time duration.

Front

What is the formula for calculating the change in velocity when a constant force is applied?

Back

The change in velocity can be calculated using the formula Δv = (F/m)Δt, where F is the force, m is the mass, and Δt is the time duration.

Front

What is the unit of impulse?

Back

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

Front

How do you find the force applied to an object if you know the change in momentum and time?

Back

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

Front

What is the significance of an airbag in terms of impulse and momentum?

Back

An airbag increases the time over which the force acts on a person during a collision, reducing the impulse and thus the change in momentum, which helps to minimize injury.