7 - Momentum

Question 1

Conservation of Momentum

Answer 1

The total momentum of a system before an event must equal the total momentum after the event, assuming no external forces act.

Question 2

Elastic Collisions

Answer 2

A collision where the total kinetic energy before the collision equals the total kinetic energy after the collision.

Question 3

Impulse

Answer 3

The change in momentum of an object when a force acts on it. It is equal to the product of the force acting on the object and the time duration of the force.

Question 4

Inelastic Collisions

Answer 4

A collision where the total kinetic energy before the collision does not equal the total kinetic energy after the collision.

Question 5

Linear Momentum

Answer 5

The product of an object’s mass and its linear velocity.

Question 6

Newton’s First Law

Answer 6

An object will remain in its current state of motion unless acted on by a resultant force. A resultant force is needed to accelerate an object.

Question 7

Newton’s Second Law

Answer 7

The sum of the forces acting on an object is equal to the rate of change of momentum of the object.

Question 8

Newton’s Third Law

Answer 8

Every action has an equal and opposite reaction. If one object exerts a force on another, the second object exerts an equal and opposite force back.