Posted by **Megan** on Sunday, January 30, 2011 at 7:29pm.

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. Forces below are magnitudes. Indicate if each statement is correct or incorrect

If M does not accelerate, then T ≤ μsN

M will accelerate if T exceed μsN

The NET force on M (if M does not move) is T

N equals Mg

T equals μsN if M remains at rest

M will accelerate if T exceeds μkN

- Physics please help!! -
**Damon**, Sunday, January 30, 2011 at 7:30pm
Hey, you try first.

- Physics please help!! -
**Megan**, Sunday, January 30, 2011 at 7:35pm
I have already and the answers I submit is wrong.

If M does not accelerate, then T ≤ μsN I

M will accelerate if T exceed μsN I

The NET force on M (if M does not move) is T C

N equals Mg C

T equals μsN if M remains at rest C

M will accelerate if T exceeds μkN I

- Physics please help!! -
**Damon**, Sunday, January 30, 2011 at 7:46pm
If M does not accelerate, then T ≤ μsN I

If it is already moving then it may accelerate with T < musN so I agree false

---------------------------

M will accelerate if T exceed μsN I

Yes it will because it will start and then the force is greater than needed for a constant speed. I say True

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The NET force on M (if M does not move) is T C

NO, if it does not accelerate the NET force is zero. (the friction exactly balances T) False

--------------------------

N equals Mg C

Yes, correct

-----------------------

T equals μsN if M remains at rest C

False, T = mus N only at the point where it starts to move. For smaller T, mus N is greater than T

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M will accelerate if T exceeds μkN I

True if and only if the mass is already moving.

- Physics please help!! -
**Megan**, Sunday, January 30, 2011 at 7:51pm
Those answers are coming up as wrong too. This problem is really frustrating me. I don't know what else to do.

- Physics please help!! -
**Aubrie**, Wednesday, February 23, 2011 at 9:50pm
I got this exact homework but my questions are slightly different. Maybe it can help u or some one else.

N equals Mg [Correct]

If M does not accelerate, then T ≤ μsN [Correct]

M will accelerate if T exceed μsN [Correct]

The NET force on M (if M does not move) is μkN [Incorrect]

M will accelerate if T exceeds μkN [Incorrect]

T equals μsN if M remains at rest [Incorrect]

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