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A mass M is initially at rest on a horizontal surface,
מקדם החיכוך הסטטי(ms) =0.30 and מקדם החיכוך הקיניטי(mk)=0.20 .
A horizontal string then pulls M with a tension T.
Forces below are magnitudes.

Correct /Incorrect : If M does not accelerate, then T £ msN
Correct /Incorrect : M will accelerate if T exceed msN
Correct /Incorrect : N equals Mg
Correct /Incorrect : M will accelerate if T exceeds mkN
Correct /Incorrect :The NET force on M (if M does not move) is mkN
Correct /Incorrect : T equals msN if M remains at rest

2006-12-09 00:04:30 · 1 answers · asked by YoraM 1 in Science & Mathematics Physics

1 answers

after translation,
static coeff of friction = 0.30
kinetic coeff of friction = 0.20

1 if "T £ msN" is "T < msN" then correct
2 correct
3 correct
4 correct only if M began to move. If it rest, then incorrect
5 incorrect. no move means Fnet = 0
6 incorrect, msN is the max force of Friction. If at rest, then force of friction equals to T as long as T is less than max

2006-12-09 00:11:56 · answer #1 · answered by Math-Chem-Physics Teacher 3 · 0 0

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