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# M1 urgent help please! watch

1. How do i do this????
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2. a) Well the box is moving at constant speed so there is no acceleration --> no resultant force. So the horizontal component of P is exactly balanced by the frictional force caused by the block. So you resolve P through the 20 degrees to find the horizontal component of P, , then set this equal to , the frictional resistance.

b) The box will now accelerate because the tension P has increased and will overcome the frictional resistance, so use with the new value of P = 150.

Hope this helps
3. It kind of does but I still cannot do part a). The answer is meant to be 110N or so.

I've got it now - Thanks a lot

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Updated: January 10, 2008
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