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Old 12-31-2010, 11:55 AM   #1
vex
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I can't tell from how you drew the friction, does it have a direction? If it has a direction you need to apply either a torque or a force to the tire to dictate the impulse of motion (or the force enough to cancel out the 'amount' of friction acting on the tire to keep it from moving). If the tire is static (which would be easier) you have drawn the FBD correctly.
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