mass M is initially at rest on a horizontal surface, ?s=0.30 and ?k=0.20 . A hor

Question

mass M is initially at rest on a horizontal surface, ?s=0.30 and ?k=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.

Select all that are True.

1.) M will accelerate if T exceeds N?s.
2.) M will decelerate if T is less than N?k.
3.) If T is less than N?s, M remains at rest.
4.) If T exceeds N?k but is less than N?s, the velocity of M will be constant.
5.) If M does not accelerate, then T ? ?sN.
6.) The value of N equals Mg.

I'm pretty sure that 1,3, and 6 are true but im not sure what else is true?

Explanation / Answer

3.) If T is less than Nµs, M remains at rest. 1.) M will accelerate if T exceeds Nµs. 6.) The value of N equals Mg.

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