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 a vector quantity.

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 calculating impulse?

Back

Impulse (J) = Force (F) × Time (t) or J = Δp (change in momentum).

Front

What is the unit of impulse?

Back

The unit of impulse is Newton-seconds (N.s) or kilogram-meters per second (kg.m/s).

Front

How does impulse relate to collisions?

Back

In collisions, the impulse experienced by an object is equal to the change in momentum it undergoes during the collision.

Front

What happens to impulse when a force is applied over a longer time?

Back

When a force is applied over a longer time, the impulse increases, leading to a greater change in momentum.

Front

If a car hits a wall vs. a haystack, which has a greater collision time?

Back

The collision time of the car hitting the haystack is greater.

Front

Calculate the impulse on a 3 kg ball slowed from 9 m/s to 3 m/s with a 5 N force.

Back

Impulse = Change in momentum = m(v_final - v_initial) = 3 kg (3 m/s - 9 m/s) = -18 N.s.

Front

A boy kicks a football with a force of 20 N for 0.3 s. What is the impulse?

Back

Impulse = Force × Time = 20 N × 0.3 s = 6 N.s.

Front

What is the change in momentum if a 10 kg object accelerates from 0 to 5 m/s?

Back

Change in momentum = m(v_final - v_initial) = 10 kg (5 m/s - 0) = 50 kg.m/s.