Chapter 6: Motion in a circle Flashcards
1
Q
Define angular displacement
A
It is the angle of rotation of body about an axis in a specific direction
2
Q
Define angular velocity
A
It is the rate of change of angular displacement with respect to time
3
Q
What is the formula of centripetal acceleration?
A
a = rw^2 = v^2/r
4
Q
Why does the resultant force of a uniform circular motion act towards the centre?
A
- A body moving a constant speed will constantly undergo a constant change in direction, indicating a change in velocity and tangential acceleration
- To maintain uniform speed, the acceleration is radially directed (perpendicular to the direction of motion) to not cause a change in speed
- By Newton’s 2nd Law, there is a net force acting towards the centre of the circle to provide this acceleration
5
Q
What happens if
net force < required centripetal force
A
The object moves away from the centre
6
Q
What happens if
net force > required centripetal force
A
The object moves towards the centre
