Impulse and Momentum HW

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 the force and the time duration for which the force acts.

Front

What is the formula for calculating momentum?

Back

Momentum (p) is calculated using the formula: p = mass (m) × velocity (v).

Front

How does impulse relate to momentum?

Back

Impulse is equal to the change in momentum of an object. Mathematically, Impulse = Δp = p_final - p_initial.

Front

What is the unit of impulse?

Back

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

Front

If a 5 N force is applied for 2 seconds, what is the impulse?

Back

Impulse = Force × Time = 5 N × 2 s = 10 N·s.

Front

What is the significance of padded dashboards in cars during accidents?

Back

Padded dashboards increase the time of impact and decrease the impact force experienced by passengers, reducing the risk of injury.

Front

Calculate the momentum of a 0.250 kg cart moving at 0.400 m/s.

Back

Momentum = mass × velocity = 0.250 kg × 0.400 m/s = 0.1 kg·m/s.

Front

What happens to momentum in a closed system?

Back

In a closed system, the total momentum before an event is equal to the total momentum after the event, according to the law of conservation of momentum.

Front

What is the effect of increasing the time of impact on force?

Back

Increasing the time of impact decreases the average force experienced, as impulse is spread over a longer duration.

Front

If a 5 kg ball has a momentum of 30 kg·m/s, what is its speed?

Back

Speed = Momentum / Mass = 30 kg·m/s / 5 kg = 6 m/s.