Focus On Physical Science: California Grade 8

Chapter 2: Forces

Standards Review

1.
The length of arrow representing a force vector depends on the ______. 2.a
A)direction of the force
B)strength of the force
C)speed of the object
D)velocity of the object
2.
Which of these is a contact force? 2.c
A)electric force
B)gravitational force
C)frictional force
D)magnetic force
3.
What is the unit for force? 2.b
A)kilogram meter
B)meter/second
C)meter/second2
D)newton
4.
The combination of all the forces acting on an object is called the __________. 2.b
A)centripetal force
B)balanced force
C)unbalanced force
D)net force
5.
What is the weight of an object? 2.d
A)the size of the object
B)the mass of the object
C)the gravitational force on the object
D)the elastic force on the object
6.
If an object is slowing down, the net force on the object is in which direction? 2.e
A)the same direction as the velocity
B)the opposite direction to the velocity
C)perpendicular to the velocity
D)perpendicular to the gravitational force
7.
What are the two forces acting a book at rest on a table? 2.d
A)gravity and a normal force
B)gravity and static friction
C)a normal force and static friction
D)gravity and sliding friction
8.
According to the law of universal gravitation, the gravitational force between two objects depends on ________. 2.g
A)the elastic forces on the objects and the distance between them
B)the masses of the objects and the distance between them
C)velocity of the objects
D)the inertia and velocity of the objects
9.
If the forces acting on an object are 37 N to the right and 19 N to the left, what is the net force on the object? 2.b
A)56 N to the right
B)18 N to the left
C)18 N to the right
D)56 N to the left
10.
If a car is moving with a constant velocity, then the forces on the car are _______. 2.c
A)zero
B)unbalanced
C)balanced
D)normal
11.
Which is true if the net force on an object is not zero? 2.c
A)The net force is a normal force.
B)The forces on the object are balanced.
C)The net force is a centripetal force.
D)The forces on the object are unbalanced.
12.
The normal force is what type of force? 2.d
A)compression force
B)tension force
C)frictional force
D)gravitational force
13.
A net force that causes an object to move in a circular path is called _______. 2.e
A)frictional force
B)centripetal force
C)elastic force
D)normal force
14.
Which two things does the acceleration of an object depend on? 2.f
A)mass and inertia
B)inertia and velocity
C)mass and net force
D)net force and velocity
15.
What is Newton's second law of motion? 2.f
A)net force equals mass divided by acceleration
B)mass equals acceleration divided by net force
C)acceleration equals normal force divided by inertia
D)acceleration equals net force divided by mass
Grade 8
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