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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
https://gyazo.com/1e1be75d9ec9c5bd0cee1e749f4bf900

Here's the solution
https://gyazo.com/07f961510855fc116ef02538a2e90170

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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