Answered

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How many 20 N bricks should you add to increase the friction force on a cart
by 80 N if the coefficient of friction is 0.8?

Sagot :

jcherry99

Answer:

5 bricks.

Explanation:

Comment

This is the kind of question where you have to invent your own formula. It is not obvious what to do.

Formula

Ff (frictional force) = mu (coeficient of friction) * weight of 1 brick * Number needed.

FF(friction force) = mu * weight 1 brick * number of bricks.

Givens

ff = 80 N

mu = 0.8

Brick weight (1 brick) = 20N

n is the number of bricks needed.

Solution

Ff = mu * weight 1 brick * number of bricks   Substitute the givens

80 = 0.8 * 20N * n                                            n is the number of bricks

80 = 16 * n                                                        Divide by 16

80/16 = 16*n/16

5 = n

You have to add 5 bricks.

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