Change in Momentum and Impulse

Front

What is impulse?

Back

Impulse (J) is defined as the change in momentum of an object when a force is applied over a period of time. It is calculated as the product of force (F) and the time duration (t) during which the force acts: J = F × t.

Front

What is the impulse-momentum theorem?

Back

The impulse-momentum theorem states that the impulse on an object is equal to the change in momentum it causes. Mathematically, J = Δp, where J is impulse and Δp is the change in momentum.

Front

How is impulse calculated?

Back

Impulse can be calculated using the formula: J = F × t, where J is impulse, F is the average force applied, and t is the time duration for which the force is applied.

Front

What is the relationship between impulse and momentum?

Back

Impulse is directly related to momentum; it causes a change in momentum. If an object experiences an impulse, its momentum changes by the same amount as the impulse.

Front

If a 4 kg ball is moving at 1 m/s and experiences an impulse of -5 N-s, what is its final velocity?

Back

The final velocity of the ball is -0.25 m/s.

Front

What is the unit of impulse?

Back

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

Front

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

Back

The impulse on the ball is 6 N⋅s.

Front

What does a force-time graph represent in terms of impulse?

Back

The area under a force-time graph represents the impulse applied to an object over a specific time interval.

Front

What happens to the momentum of an object if no net external force acts on it?

Back

If no net external force acts on an object, its momentum remains constant (law of conservation of momentum).

Front

What is the formula for calculating change in momentum?

Back

Change in momentum (Δp) is calculated as: Δp = m(v_f - v_i), where m is mass, v_f is final velocity, and v_i is initial velocity.