Chapter 16 - Circular Motion

Question 1

Define Uniform Circular Motion

Answer 1

The motion of a body about a circular path at a constant speed.
The resultant force continually acts perpendicular to the tangential velocity.

Question 2

Is there an acceleration in the vertical plane

Answer 2

No

Question 3

Is there a resultant force in the vertical plane

Answer 3

No

Question 4

How to start to derive Newton’s second law

Answer 4

F is proportional to A, but A is inversely proportional to m.

Question 5

Explain the vertical plane

Answer 5

Add in weight as well.

Question 6

Explain the horizontal plane

Answer 6

No weight.

Question 7

Newton’s 1st Law

Answer 7

A body remains at rest, on at constant velocity, unless a resultant force acts upon it.

Question 8

Newton’s 2nd Law

Answer 8

The rate of change of momentum is equal to the resultant force acting upon an object.

Question 9

Newton’s 3rd Law

Answer 9

When 2 bodies interact, they exert a force on each other that is equal in magnitude but opposite in direction.

Question 10

Explain Newton’s Laws in Circular Motion

Answer 10

By Newton’s 1st law that states, a force will remain at rest or in constant velocity unless a resultant force acts upon it. This means that there is a centripetal force that acts continually towards the centre of the motion, so perpendicular to the velocity.

By Newton’s second law that states, the rate of change of momentum is equal to the resultant force acting upon the object. The object experiences a rate of change of momentum (acceleration), in the direction of the resultant force, so towards the centre of the circular motion.

By Newton’s 3rd Law of Motion that states that the body exerts a force equal in magnitude but opposite in direction upon the point at the centre.