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A box is pulled across a horizontal surface at a constant speed by a horizontal rope with tension T=30N. The coefficient of friction between the box and surface is uk = 0.05.

1. Calculate the work done by friction as the box moves 4 meters to the right.

i thought it would be .05 x 30 x 4 since work is F x D but it isn't

2. What is the mass of the box.

• physics -

Multiply pulling force by distance for the work done.

Use the uk value to get the mass of the boss.

Friction force = M*g*uk

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