Momentum

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 the unit of momentum?

Back

The unit of momentum is kilogram meter per second (kg*m/s).

Front

Is momentum a scalar or vector quantity?

Back

Momentum is a vector quantity, meaning it has both magnitude and direction.

Front

What happens to momentum in a closed system during a collision?

Back

In a closed system, the total momentum before the collision is equal to the total momentum after the collision (law of conservation of momentum).

Front

Calculate the momentum of a 50 kg object moving at 5 m/s.

Back

Momentum = mass × velocity = 50 kg × 5 m/s = 250 kg*m/s.

Front

What is the purpose of crumple zones in cars?

Back

Crumple zones are designed to increase the time of impact during a collision, reducing the force experienced by occupants.

Front

If two objects collide and stick together, how do you calculate their final speed?

Back

Use the conservation of momentum: (m1*v1 + m2*v2) / (m1 + m2) = final speed.

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 impulse = force × time.

Front

How does increasing the time of impact affect the force experienced during a collision?

Back

Increasing the time of impact decreases the force experienced, as force is inversely proportional to the time of impact (F = Δp/Δt).

Front

What is the momentum of a 1.5 kg cart moving at 2 m/s?

Back

Momentum = mass × velocity = 1.5 kg × 2 m/s = 3 kg*m/s.