Module 5: Circular Motion

Question 1

What is the relationship between
- Centripetal Force
- Mass
- Speed
- Radius

Answer 1

Centripetal Force has a direct correlation with Mass and/or Velocity, but with radius, has an inverse correlation

Question 2

Forces acting upon a moving car around a horizontal circular bend

Answer 2

• Weight Force
• Friction Force
• Normal Force (Vertical and Horizontal Component)

Question 3

Forces acting upon a mass on a string

Answer 3

• Tension Force

Question 4

Centripetal Acceleration

Answer 4

V^2 on R

Question 5

Velocity

Answer 5

2piR over Period

Question 6

Centripetal Force

Answer 6

mv squared on R

Question 7

Angular Velocity

Answer 7

Change in Degrees over time OR V on R

Question 8

What is the relationship between work done and total energy on uniform circular motion

Answer 8

Uniform Circular Motion refers to the net force (Fc) acting 90 degrees to the object’s direction of movement. Therefore it is always cos90 which equals zeros. Hence, work done during uniform circular motion is zero.

Question 9

What is Torque

Answer 9

The rate of change of angular momentum (can be equal to energy if multiplied by the rotation rate) . The Twisting Force

Question 10

Torque Formula

Answer 10

r (distance between pivot point), Force, sin(theta) all multiplied