# physics

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A block weighing 6.8 N requires a force of 2.9 N to push it along at constant velocity.
What is the coefficient of friction for the
surface?

• physics -

Let Ff = Force of Friction
Let C = Coefficient of Friction
Let N = Normal force

Ff = CN

The required force to just get a block moving along at a constant velocity will also be equal to the force of friction (Ff) if there is nothing else acting on the horizontal plane. N can be calculated using the block's weight. So;

C = N/Ff

• physics -

0.44N

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