Homework Help: 11th grade

Posted by Bill on Sunday, December 5, 2010 at 8:26pm.

A box of books weighing 229 N is shoved across the floor by a force of 420 N exerted downward at an angle of 35° below the horizontal.If ľk between the box and the floor is 0.75, how long does it take to move the box 7 m, starting from rest? (If the box will not move, enter 0.)

Physics?? - Writeacher, Sunday, December 5, 2010 at 8:39pm
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11th grade - bobpursley, Sunday, December 5, 2010 at 8:43pm
TAke the downward component of the force, add that to weight, to find the normal force. Then you can calculate friction force.

Compute the horizontal component of the pushing force.

horizontal force-friction=mass*acceleration

find acceleration.

distance=1/2 a t^2 solve for time.

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