Module 3.5 - Newton's Laws Of Motion

Question 1

Newton’s First Law

Answer 1

A body will remain at rest or continue to move in a straight line at a constant velocity unless an external force acts on it

Question 2

Newton’s Second Law

Answer 2

The resultant force on an object is proportional to the rate of change of momentum of the object, and the momentum change takes place in the direction of the force

Question 3

Newton’s Third Law

Answer 3

If object A exerts a force on object B, object B will exert an equal and opposite force on object A

Question 4

What are the requirements for Newton’s Third Law?

Answer 4

The forces must be of the same type

The forces involved must be acting in opposite directions on different objects

Question 5

Define momentum

Answer 5

Mass of an object multiplied by its velocity

Question 6

Principle of Conservation of Momentum

Answer 6

Total momentum before a collision is equal to the total momentum after the collision, provided there are no external forces involved

Question 7

What is momentum’s relationship to mass and velocity?

Answer 7

Directly proportional

Question 8

Define impulse

Answer 8

The product of a force and the time for which the force acts

Question 9

What is the area underneath a force-time graph?

Answer 9

Impulse

Question 10

Rules for elastic and inelastic collisions

Answer 10

In all collisions momentum is conserved
In elastic collisions kinetic energy is also conserved
In elastic collisions the velocity of approach equals the velocity of separation