# Three slabs are stacked vertically with the lowest slab being on wheels as shown below. An applied force of #44N# acts horizontally on the bottom slab. How do you find the answers to the following questions?

##
a. What is the acceleration of the system if the slabs do not slip?

b. How much friction acts between the bottom and middle slab?

c. What coefficient of friction is necessary to prevent slipping between the middle and bottom slab?

d. How much friction is needed between the top and middle slab to prevent slipping?

a. What is the acceleration of the system if the slabs do not slip?

b. How much friction acts between the bottom and middle slab?

c. What coefficient of friction is necessary to prevent slipping between the middle and bottom slab?

d. How much friction is needed between the top and middle slab to prevent slipping?

Using Newtons Second Law of motion

Inserting given values

c. We know that

From Newton's Third Law of motion we know that Action and reaction are equal and opposite.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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