Circular motion

Question 1

Why is an object moving in a circle accelerating even if its speed is constant?

Answer 1

acceleration is the rate of change of velocity
velocity is a vector quantity
so if the direction is constantaly changing the ball must be accelerating

Question 2

What is centripetal force (definition)?

Answer 2

Centripetal force is the net force which acts perpendicular to the direction of the velocity, towards the centre of the circle.

Question 3

What is inertia?

Answer 3

Inertia is a resistance to a change in motion

Question 4

What is the symbol for angular velocity?

Answer 4

w

Question 5

What is centripetal acceleration measured in? linear or not?

Answer 5

ms-2 linear acceleration

Question 6

What is accelerations realationship to the radius?

Answer 6

acceleration is inversly proportional to the radius

Question 7

Define angular speed/velocity

Answer 7

The rate of change in angular displacement with respect to time.

Question 8

Define centripetal acceleration

Answer 8

The acceleration of an object towards the center of a circle when an object is in motion rotating around a circle. At a constant speed

Question 9

What does centripetal force do?

Answer 9

Keeps a body in uniform circular motion

Question 10

Is centripetal force a scalar or vector?

Answer 10

Vector

Question 11

What is angular velocity measured in?

Answer 11

Rad s-1