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Chapter 4 Quiz - Newton's Laws & Friction
Physics I - Mr. Youngblood
Part I: Theory
1. What are Newton's three laws of motion?
1.
2.
3.
2. Define normal force.
3. What is the difference between static & kinetic friction?
Part II: Calculations
4. Convert the following:
a. 267 kg = ________ N
b. 130,000 N = ________ kg
c. 8,275 g = ________ N
5. A large rodent has a mass of 1.25 kg. It rests on a table where the
coefficient of friction () is .47. (a) What is the normal force?
(b) What is the static frictional force?
6. A force of 150. N is applied to a giant jack-o-lantern on a level surface.
If the pumpkin's mass is 75.0 kg, what will its acceleration be if the
coeficient of friction is  = 0.35?
7. Draw a free body diagram for each of the following. Be sure to label all
forces acting on the object:
a. A witch sitting on the ground being dragged to the right by a wolf.
b. Dracula on a sled sliding down an incline of 20o to the horizontal.
c. A sailboat floating on the ocean with a wind blowing from the east.
8. Refer to the situation in problem 7a. If the force the wolf pulls with is
725 N, the witch's mass is 62.5 kg, and the coefficient of friction () =
0.85, (a) what is the net force acting on the witch? (b) What will the
acceleration of the witch be? (c) How fast will the witch be going after
20.0 s (assume the witch starts at rest)?
9. Refer to the situation in problem 7b. If Dracula’s mass is 80.0 kg, and the
coefficient of friction between the sled and the snow is  = 0.05 (a) what is
the net force acting on Dracula (& the sled)? (b) How fast will Dracula be
going after 10.0 s?
10. A pumpkin with a mass of 500.0 kg sits on a level surface. You have tied
a rope to the pumpkin on which you pull upward at an angle of 40.0 degrees
with a force of 650.0 N. If the coefficient of friction between the pumpkin
and the ground is 0.25 (a) what is the net force acting on the pumpkin? (b)
What will the acceleration of the pumpkin be? (c) How far will the pumpkin
have traveled after 10 seconds if it started at rest?
11. Some witch’s are playing hockey on a frozen river with a pumpkin instead
of a hockey puck. If a witch hits the pumpkin giving it an initial speed of
25.0 m/s, how far will it travel before it comes to a complete stop? The
mass of the pumpkin is 8.50 kg and the coefficient of friction is 0.025.