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P is the contact point of a wheel with the ground. An angular acceleration causes the wheel cause at P. There a friction forces must act on the wheel at P to oppose that tendency.
However when a wheel rolls down a ramp, there is a force Fgsin(a). This causes the wheel to accelerate. However it is plainly obvious that there is a friction force against the direction the wheel is rolling in.
Can anyone help me resolve this apparent contradiction. Thanks
However when a wheel rolls down a ramp, there is a force Fgsin(a). This causes the wheel to accelerate. However it is plainly obvious that there is a friction force against the direction the wheel is rolling in.
Can anyone help me resolve this apparent contradiction. Thanks