Date
Period
6
Name
Chapter Assessment
Use with Chapter 6.
Forces
Understanding Concepts Part A
Write the letter of the choice that best completes the statement or answers the question.
1. According to Newton’s
law, an object with no net force acting on it remains at rest or in
motion with a constant velocity.
a. first
b. second
c. third
2. Losing speed as you ride your bike uphill demonstrates Newton’s
a. first
b. second
law.
c. third
3. If you push against a wall, the wall pushes back against you with
a. no
b. less
4. An object is in equilibrium if
c. equal
force.
d. more
.
a. it has no weight
c. it is accelerating
b. the net force on it is zero
d. only one force is acting on it
5. The gravitational force exerted by a large body, such as Earth, is
a. weight
c. acceleration
b. mass
d. inertial mass
6. Mass and weight are related by
Copyright © by Glencoe/McGraw-Hill
.
.
a. the force of gravity
c. friction
b. newtons
d. inertia
7. If the weight of a balloon is 3000 N and the lift force provided by the atmosphere is
3300 N, in which direction is the net force acting?
a. upward
c. toward the east
b. downward
d. toward the north
8. When the drag force on an object equals the force of gravity, the object attains
a. acceleration
c. terminal velocity
b. inertial mass
d. maximum mass
9. The period of a simple pendulum depends upon
.
.
a. the mass of the bob
c. the amplitude of the swing
b. the length of the pendulum
d. the stiffness of the pendulum
10. To produce mechanical resonance, the time between applied forces must equal the
the object.
a. period
c. length
b. frequency
d. mass
Physics: Principles and Problems
of
Chapter Assessment 23
6
Name
Chapter Assessment
Understanding Concepts Part B
Answer the following questions, showing your calculations.
1. What force is required to accelerate a 6.0-kg bowling ball at 12.0 m/s2?
2. What is the mass of a cat that weighs 30.0 N?
3. What is the tension in a rope that is supporting a 4.2-kg bucket?
4. A net force of 1125 N acts on an object. Find the single force that will produce equilibrium.
6. A 65-kg roller skater moves at a constant speed with a force of 75 N. What is the coefficient of friction between the skater and the floor of the roller rink?
24
Chapter Assessment
Physics: Principles and Problems
Copyright © by Glencoe/McGraw-Hill
5. The coefficient of sliding friction between a 78-kg box and a warehouse floor is 0.21. How much
force is needed to keep the box moving at a constant velocity across the floor?
6
Name
Chapter Assessment
Applying Concepts
Answer the following questions, using complete sentences.
1. Explain the relationship between mass and weight on Earth. Would this relationship change on
Mars? Give a reason for your answer.
2. An elevator is traveling from the lobby to the top of a building. As it slows to a stop on the top
floor, what happens to your apparent weight?
Copyright © by Glencoe/McGraw-Hill
3. In the drawing below, use arrows to show the two horizontal and two vertical forces acting on the
boat as it is pulled to the shore at a constant speed. Is there a net force on the boat?
Physics: Principles and Problems
Chapter Assessment 25
6
Name
Chapter Assessment
4. Explain what is meant by an interaction pair. Use the boat in the drawing on page 25 to give an
example.
5. Suppose you pull on a rope tied to a large carton but you cannot move the carton. What forces are
acting on your hand?
6. Describe the displacement, speed, and acceleration of a mass suspended on a vibrating spring as it
passes through its equilibrium point.
7. Cite an example of the electromagnetic interaction as a long-range force.
Copyright © by Glencoe/McGraw-Hill
26
Chapter Assessment
Physics: Principles and Problems
6
Name
Chapter Assessment
Answer the following questions, showing your calculations.
8. An elevator with a mass of 1.10 3 103 kg accelerates upward at 0.45 m/s2. What is the force acting
on the elevator’s support cable?
9. A rocket weighs 2.0 3 107 N. Its engines exert a force of 125 3 106 N at liftoff.
a. What is the mass of the rocket?
Copyright © by Glencoe/McGraw-Hill
b. What is its acceleration when it lifts off?
c. The average acceleration of the rocket during its 7.0-min launch is 10.0 m/s2. What velocity
does it reach?
Physics: Principles and Problems
Chapter Assessment 27
6
Name
Chapter Assessment
10. A 47-N box is pulled along a frictionless horizontal surface by a 25-N weight hanging from a cord
on a frictionless pulley.
a. What is the acceleration of the box and the weight?
Copyright © by Glencoe/McGraw-Hill
b. What force is exerted on the cord?
28
Chapter Assessment
Physics: Principles and Problems