Module 5 - Section 2 [UCM + Torque]

Question 1

Define uniform circular motion

Answer 1

Uniform Circular Motion is when a body travels a circular trajectory at a constant speed

Question 2

Recall features of uniform circular motion

Answer 2

Features of Uniform Circular Motion:
- Constant speed
- Constant acceleration (magnitude)
- Constant [centripetal] force
- Changing direction of velocity and acceleration
- No net work

Question 3

Define centripetal acceleration

Answer 3

Centripetal Acceleration is the acceleration due to circular motion

Question 4

Define centripetal force

Answer 4

Centripetal Force is a force that is directed towards the centre of the circle perpendicular to the velocity

Question 5

Define tangential velocity

Answer 5

Tangential Velocity is the instantaneous velocity of a body undergoing circular motion

Question 6

Define angular velocity

Answer 6

Angular Velocity is the rate of change of the angular displacement

Question 7

Compare and contrast centripetal and centrifugal force

Answer 7

Centripetal vs Centrifugal force:
- Both forces are applied in circular motion
- Centripetal force is an inwards force
- Centrifugal force is an outwards force
- Centrifugal force is a pseudo force that can only be observed in a rotating frame of reference

Question 8

Identify what forces supply centripetal force

Answer 8

Centripetal force is supplied by:
- Tension force
- Static friction force

Question 9

Define critical speed

Answer 9

Critical Speed is the minimum speed necessary to be in circular motion

Question 10

Define torque

Answer 10

Torque is a rotational force exerted on an object

Question 11

True or False. Rotational Equilibrium is when the net torque is equal to 0

Answer 11

True

Question 12

True or False. No net force is equal to no net torque

Answer 12

False. No net force does not equal to no net torque

Question 13

Define rotational inertia

Answer 13

Rotational Inertia is the tendency of a body to resist rotational motion