Impulse

Front

What is impulse?

Back

Impulse is 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 and the time duration over which the force acts.

Front

What is the formula for impulse?

Back

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

Front

How does impulse relate to momentum?

Back

Impulse is equal to the change in momentum of an object. If an object has an initial momentum (Pi) and a final momentum (Pf), then Impulse = Pf - Pi.

Front

If an object has an initial momentum of 20 kgm/s and a final momentum of 30 kgm/s, what is the impulse?

Back

Impulse = Pf - Pi = 30 kgm/s - 20 kgm/s = 10 kgm/s.

Front

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

Back

The greater the force applied over a longer time, the greater the impulse and the change in momentum.

Front

What happens to the force experienced by a driver in a car crash if an airbag is used?

Back

The airbag extends the time of impact, reducing the force experienced by the driver.

Front

True or False: Impulse can be calculated without knowing the time duration of the force applied.

Back

False. Time duration is essential to calculate impulse.

Front

If a 5N force acts for 4 seconds, what is the impulse?

Back

Impulse = Force × Time = 5N × 4s = 20 Ns.

Front

What is the effect of dropping an egg on water versus a hard surface in terms of impulse?

Back

Both eggs experience the same impulse, but the time taken to stop is longer for the egg in water, reducing the force experienced.

Front

What is the unit of impulse?

Back

The unit of impulse is Newton-seconds (Ns) or kgm/s.