We studied motion in two dimensions. We learned how to break down two dimensional forces into x and y directions. We also know how to generate a force from two (or more) forces. We also dealt with forces involving gravity.

You can use the formula sheet if you need some help.

Chapter 5 Quiz

1. A dog walks 1 km due east, then 300 m north, and finally 500 m west. What is the resulting displacement of the dog?

(e.g. "100.0 m NE")

2. Three students push a box. Michael pushes with a force of 200 N at 0 degree. Shannon exerts a force of 150 N at 30 degrees, and Adam pushes with 175 N at 145 degrees. What is the magnitude of the net force?

N

3. A 10 kg picture is hanging on a wall by two ropes.

a. How big is the force exerted by the block above?

N

b. Are the forces acting on the ropes A and B equal in magnitude?

(Yes/No)

c. How big is the force acting on the rope A?

N

4. The roof on a house is at 10 degrees inclined. A 50 kg box is on the roof.

a. What is the magnitude of the force of gravity on the box?

N

b. What is the force of normal acting on the box?

N

c. What will the acceleration of the box be if there is no friction?

m/s²

d. If the coefficient of friction between the box and the roof is 0.15, will the box move?

(Yes/No)

e. If so, how fast?

m/s²

5. A 3 kg block slides down a 30 degree inclined plane with constant acceleration of 0.5 m/s². The block starts from rest at the top. The length of the incline is 2 m.

a. What is the velocity of the block at the bottom?

m/s

b. What is the magnitude of the force of normal on the block?

N

c. What is the coefficient of friction between the plane and the block?

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