If we imagine the object as a piece of paper sitting on top of a piece of cardbo

Question

If we imagine the object as a piece of paper sitting on top of a piece of cardboard, and we stick a

pin through the paper into the cardboard at the pivot point, some of the forces in our drawing will

act to rotate the object clockwise, and some counterclockwise. For example, Force?F 1 would pull

the top right part of the object to the right, and would cause the object to rotate clockwise abouy

the pivot point. State whether the other four forces would act to rotate the object clockwise,

counterclockwise, or neither.

F2       F3          F4          F5

The magnitude of the torque for each force is the product of this shortest distance and the force.

For example, the torque due toF 1 is clockwise and has magnitude F1 d1. What is the magnitude

of the torque for F5?

?

Explanation / Answer

If the arbitary object has no angular acceleration about point P ,then the sum of all the clockwise torques will be equal to sum of all counterclockwise torques, so net torque will be zero.

F1 = Clockwise
F2 = Neither and Theta = 180
F3 = clockwise
F4 = Counterclockwise
F5 = counterclockwise

T5 = - F5 * d1

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