G484 - Newton's Laws and Momentum

Question 1

Newton’s Second Law of Motion

Answer 1

When a net force acts on an object, the rate of change of momentum is directly proportional to the force
The change of momentum occurs in the direction of the force
F=ma is a special case of Newton’s second law where m is constant

Question 2

Newton’s Third Law of Motion

Answer 2

When one body exerts a force on another, the other body exerts an equal and opposite force on the first body

Question 3

Linear Momentum

Answer 3

The product of mass and velocity

A vector quantity

Question 4

Net Force

Answer 4

Resultant force acting on a body
It is equal to the rate of change of momentum Ft = mv - mu
F = ∆ρ / ∆t

Question 5

Impulse

Answer 5

The product of force and time for which it acts
Impulse is equal to change in momentum
I = Ft = mv - mu

Question 6

What quantity does the area under a force time graph represent?

Answer 6

Impulse

Question 7

The Principle of Conservation of Momentum

Answer 7

Total momentum before the collision is equal to the total momentum after the collision

Question 8

Perfectly Elastic Collision

Answer 8

Kinetic energy is completely conserved

Question 9

Inelastic Collision

Answer 9

Some loss of kinetic energy during the collision

Question 10

Momentum and Kinetic Energy

Answer 10

Momentum is always conserved in a closed system
Kinetic energy is not always conserved, it can be transferred to other forms of energy
In the interaction between bodies, some change in kinetic energy usually occurs

Question 11

Newton’s First Law of Motion

Answer 11

An object continues in a state of rest or uniform motion in a straight line unless acted on by a net force