Focus On Physical Science: California Grade 8

Lesson 2: Types of Forces

Standards Check

1.
__________ is a force that resists motion between two surfaces that are in contact. 2.d
A)Acceleration
B)Friction
C)Inertia
D)Resistance
2.
Which of the following types of friction keeps an object at rest? 2.d
A)sliding
B)rolling
C)static
D)mobile
3.
__________ is the pull that all objects exert on each other. 2.d
A)Resistance
B)Inertia
C)Friction
D)Gravity
4.
The strength of the gravitational force between two objects depends on which of the following? 2.d
A)the mass of the objects and the distance between them
B)the velocities of the objects
C)the mass of the larger object
D)the orbits of the objects
5.
__________ measures the quantity of matter of an object. 2.d
A)Mass
B)Weight
C)Net force
D)Density
6.
Friction always acts __________ the direction of motion of an object. 2.d
A)in the same direction as
B)opposite to
C)perpendicular to
D)at a 45° angle to
Grade 8
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