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1. 1. Section 8.4Torque
2. 2. Torque How do I calculate torque?
3. 3. Torque How do we cause a rotational motion? Apply a force The position and direction of the force make a difference
4. 4. Lever Arm Lever Arm: The perpendicular distance from the axis of rotation to the point the force is applied
5. 5. Lever Arm The longer the better
6. 6. Relationships
7. 7. Lever Arm FA: = Distance from hinge to knob FD = zero FC: trig
8. 8. Determining Torque Equation
9. 9. Torque Equation
10. 10. ExampleThe biceps muscleexerts a vertical forceon the lowerarm, bent as shown.For eachcase, calculate thetorque about the axisof rotation throughthe elbowjoint, assuming themuscle is attached5.0 cm from theelbow as shown.
11. 11. ExampleThe biceps muscleexerts a vertical forceon the lowerarm, bent as shown.For eachcase, calculate thetorque about the axisof rotation throughthe elbowjoint, assuming themuscle is attached5.0 cm from theelbow as shown.
12. 12. Example Two thin disk-shaped wheels or rA = 30 cm and rB = 50 cm, are attached to each other on an axle that passes through the center each. Calculate the net torque on this compound wheel due to the two forces shown, each of magnitude 50 N.
13. 13. Homework Read Section 8.4 Do Problems # 22 – 26, page 220