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  • 1 Post By studiot
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July 5th, 2016, 06:52 AM   #1
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Engineering Statics problem, involving a circle and a block

Here's the problem

Here's the solution

My question is: Doesn't the floor have a reaction? Why wasn't that taken into account in the solution?
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July 5th, 2016, 09:08 AM   #2
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Yes until the instant of lift, there is a reaction from the floor.
But this must disappear as soon as the wheel starts to lift.

This is very similar to limiting friction where the static coefficient applies at the instant of slip.

Note the wording of the question:

"To start the wheel over the step"
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July 5th, 2016, 12:52 PM   #3
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GOT IT. Thanks a lot.
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