1. Torque

2. Definition The tendency of a force applied to an object to cause rotation about an axis.

3. F r Factors affecting the Torque

4. F r Torque is a product of the moment arm (r) and the force F

5.  = r F sin 

6. F r  F

7. r  F sin90 = 1

8. Moment of Inertia A property of an object that depends on the distribution of mass about the axis of rotation. Mass close to the axis of rotation = smaller moment of inertia Mass at a distance from the axis of rotation = larger moment of inertia

9.  I 

10. r = 1.5 m F = 100 N  = 32 o  = 10 kgm 2  = ? θ

11. r = 0.25 F = 100 N I = 20 kgm 2 What is v at the edge of the wheel after 2 seconds? v i = 0 R = 0.75m

12. Note, foot speed is only