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January 27, 2015

January 27, 2015

Posted by **COFFEE** on Saturday, February 10, 2007 at 9:00pm.

* Physics/Math - bobpursley, Saturday, February 10, 2007 at 7:10pm

Force friction= mu*17= 11.6N

weight= 6N. Force of friction prevents it from moving.

Ok, so in unit-vector notation the force would be (11.56 N)i + (0 N)j???

No. The wall exerts friction upward, and exerts a counter force of 17 N horizontally.

As a matter of clarification, the force of friction is not 11.6 N, it is 6 N exactly equaling the block weight. The formula mu*force normal is the maximum friction. (f it were greater then 6N the block would move upward, which is not going to happen.

Well if it will not move upward then wouldn't the i component for the final answer be 0 N? That's what I thought it would be but it is incorrect so I am stuck.

the force exerted by the wall, according to newton, would be an equal and opposite reaction, so for the i direction it would be the negative of the force the block places on the wall. the j direction would be the weight of the block

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