My Math Forum Engineering Statics problem, involving a circle and a block

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 July 5th, 2016, 07:52 AM #1 Newbie   Joined: Oct 2012 Posts: 29 Thanks: 0 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?
 July 5th, 2016, 10:08 AM #2 Senior Member   Joined: Jun 2015 From: England Posts: 891 Thanks: 269 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" Thanks from Volle
 July 5th, 2016, 01:52 PM #3 Newbie   Joined: Oct 2012 Posts: 29 Thanks: 0 GOT IT. Thanks a lot.

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