As shown in the figure below, a bicycle wheel is at rest against a curb. If the

Question

As shown in the figure below, a bicycle wheel is at rest against a curb. If the wheel has a radius R, mass M and is at rest against a curb of height

determine the minimum horizontal force

(in terms of M and g) that must be applied to the axle to make the wheel start to rise up over the step.
F =

As shown in the figure below, a bicycle wheel is at rest against a curb. If the wheel has a radius R, mass M and is at rest against a curb of height h = 0.18R, determine the minimum horizontal force (in terms of M and g) that must be applied to the axle to make the wheel start to rise up over the step. F =

Explanation / Answer

When the wheel just starts to rise up it rotates about the corner of the step and Normal reaction is 0.

therefore F*(R-h)=M*g*R

==) F=M*g/0.82=1.22*M*g

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