PHYSICS - Forces - Momentum

This video tutorial covers the concept of momentum, its calculation, and its application in describing object movement. It explains the law of conservation of momentum, particularly in elastic collisions, and provides examples to illustrate these principles. The video also differentiates between force and momentum, emphasizing balanced forces in constant velocity scenarios. Practical examples and questions are used to reinforce understanding.

What happens to a car's speed if the engine force is greater than the frictional force?

• The car maintains its speed.

• The car slows down.

• The car speeds up.

• The car stops.

If a car is slowing down, in which direction is the net force acting?

• Downwards

• Upwards

• Backwards

• Forwards

How is momentum calculated?

• Velocity minus mass

• Mass divided by velocity

• Mass times velocity

• Velocity divided by mass

What is the momentum of a stationary object?

• Equal to its mass

• Equal to its velocity

• Zero

• Equal to its weight

What does the law of conservation of momentum state?

• Momentum is always lost in collisions.

• Total momentum before an event is equal to total momentum after.

• Momentum is created during collisions.

• Momentum is only conserved in elastic collisions.

In a collision where two objects stick together, what happens to their combined velocity?

• It is the sum of their initial velocities.

• It becomes zero.

• It is determined by the conservation of momentum.

• It is the average of their initial velocities.

Why does the end ball in a Newton's cradle move off at the same speed as the colliding one?

• Because of air resistance.

• To conserve momentum.

• Due to gravitational force.

• Because of friction.