Impulse and Momentum - Concept Review

Front

What does the law of conservation of momentum state?

Back

The law of conservation of momentum states that the total momentum of a closed system remains constant if no external forces act on it. This means that the momentum before an event (like a collision) is equal to the momentum after the event.

Front

Is it advisable for a football player to 'tighten up and brace' for a tackle?

Back

No, it is better for the player to 'loosen up and relax' because this will extend the time of impact and reduce the force experienced from the tackle.

Front

What type of quantity is momentum?

Back

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

Front

What happens to the momentum of an object when its speed is doubled?

Back

When the speed of an object is doubled, its momentum also doubles, since momentum is directly proportional to velocity.

Front

What is the formula for impulse?

Back

Impulse is given by the formula: Impulse = Force (F) × Time interval (Δt), or represented as FΔt.

Front

Define impulse in terms of momentum.

Back

Impulse is defined as the change in momentum of an object when a force is applied over a period of time.

Front

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

Back

Impulse is equal to the product of the average force applied to an object and the time duration over which the force is applied.

Front

How does increasing the time of impact affect the force experienced?

Back

Increasing the time of impact reduces the average force experienced, as force is inversely proportional to the time of impact for a given impulse.

Front

What is the unit of momentum in the SI system?

Back

The unit of momentum in the SI system is kilogram meter per second (kg·m/s).

Front

What is the principle of conservation of momentum in collisions?

Back

In a closed system, the total momentum before a collision is equal to the total momentum after the collision, provided no external forces act on the system.