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?
3. A 10 kg picture is hanging on a
wall by two ropes.
a. How big is the force exerted
by the block above?
b. Are the forces acting on the
ropes A and B equal in magnitude?
c. How big is the force acting
on the rope A?
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?
b. What is the force of normal
acting on the box?
c. What will the acceleration
of the box be if there is no friction?
d. If the coefficient of
friction between the box and the roof is 0.15,
will the box move?
e. If so, how fast?
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?
b. What is the magnitude of the
force of normal on the block?
c. What is the coefficient of
friction between the plane and the block?
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