Alittle boy pushes a 12 kg box of library books with a constant velocity along the sidewalk by applying a horizontal force of 96n. calculate the weight, normal force, frictional force and coefficient of friction between the box and the sidewalk

Weight calculation:

The weight by definition, is given by:

W = m * g

Where,

m: mass of the book box

g: acceleration of gravity

Substituting values we have:

W = 12 * 9.8

W = 117.6 N

Calculation of normal force:

For normal force, we make a free-body diagram in vertical direction, therefore, we have to:

Fn - W = 0

Rewriting we have:

Fn = W

Substituting values:

Fn = 117.6 N

Calculation of the friction force:

For the force of friction, we make a diagram of free body in horizontal direction, therefore, we have to:

96 - Fs = 0

Note: we equate to zero because the speed is constant, therefore, the acceleration is equal to zero.

Clearing we have:

Fs = 96

Calculation of the coefficient of friction:

By definition, we have to:

Fs = μFn

Clearing the coefficient of friction we have:

μ = Fs / Fn

Substituting values:

μ = 96 / 117.6

μ = 0.82

no simpler subs form complex ones. synthesise = make

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.