9. a 5.0 kg block on an inclined plane is acted upon by a horizontal force of 100 n shown in the figure below. the coefficient of friction
between block and plane is 0.30.
a. what is the acceleration of the block as it is moved up the plane?
b. how long will it take the block to go 0.50 m when starting from rest?
100 n

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A: The acceleration is 7.7 m/s up the inclined plane.

B: It will take the block 0.36 seconds to move 0.5 meters up along the inclined plane

Explanation:

Let us work with variables and set

As shown in the attached free body diagram, we choose our coordinates such that the x-axis is parallel to the inclined plane and the y-axis is perpendicular. We do this because it greatly simplifies our calculations.

Part A:

From the free body diagram we see that the total force along the x-axis is:

Now the force of friction is where is the normal force and from the diagram it is

Thus

Therefore,

Substituting the value for we get:

Now acceleration is simply

The negative sign indicates that the acceleration is directed up the incline.

Part B:

Which can be rearranged to solve for t:

Substitute the value of and and we get:

which is our answer.

Notice that in using the formula to calculate time we used the positive value of , because for this formula absolute value is needed.

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