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April 19, 2014

Homework Help: Physics

Posted by Cori Smith on Tuesday, June 18, 2013 at 8:42pm.

A mass M is initially at rest on a horizontal surface, μs=0.30 and μk=0.20 . A horizontal string then pulls M with a tension T. N is the normal component of the contact force. All quantities below are magnitudes. Answers are either true or false.
1)The total force on M is μkN if M remains at rest.
2)If M does not accelerate, then T ≤ μsN
3)M will accelerate if T exceeds μkN
4)T equals μkN if M remains at rest.
5)The value of N equals Mg
6)M will accelerate if T exceed μsN

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