21 - Torque

# 21 - Torque - Torque and equilibrium Homework handout 8 10...

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Torque and equilibrium Homework: handout 8, 10, 13

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Predict the readings on the scales: ? 10 30 20 0 ? 10 30 20 0 0.5m 1.0 m 1.0 kg M bar = 1.0 kg
Predict the readings on the scales: 10 30 20 0 10 30 20 0 0.5m 1.0 m 1.0 kg 10 N 10 N M bar = 1.0 kg

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Predict the readings on the scales. ? ? 0.8 m A. T L =4N; T R =16N B. T L =5N; T R =15N C. T L =6N; T R =14N D. T L =7N; T R =13N E. T L =8N; T R =12N
Now predict the readings: ? 10 30 20 0 ? 10 30 20 0 0.8m 1.0 m 1.0 kg M bar = 1.0 kg a = 0 does not give us enough info.

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Which force is more effective in causing rotation? standard frictionless pond standard meter stick F 1 F 2 standard pivot point
Which force is more effective in causing rotation? standard frictionless pond standard meter stick F 1 F 2 standard pivot point B A

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Now which force is more effective in causing rotation? standard frictionless pond standard meter stick F 1 F 2 standard pivot point
Now which force is more effective in causing rotation? standard frictionless pond standard meter stick F 1 F 2 standard pivot point B A

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Definition of torque ( τ ): Fixed Pivot Point F r θ () sin rF τ θ = α rotational analog of 2 nd law There are two useful methods of finding torque Force method Lever arm method
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21 - Torque - Torque and equilibrium Homework handout 8 10...

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