Focus On Physical Science: California Grade 8

Chapter 2: Forces

Standard Assessment

1.
You are moving a dresser that has a mass of 36 kg; its acceleration is 0.5 m/s2. What is the force being applied? 2.f
A)72 N
B)1.8 N
C)35.5 N
D)18 N
2.
Newton's second law of motion states that __________. 2.f
A)when a force is applied on an object, there is an equal force applied by the object in the opposite direction
B)the force on an object can be found by dividing its mass by its acceleration
C)acceleration is calculated by dividing the force exerted on an object by the mass of the object, and that when a force acts on an object, its acceleration is in the same direction as the force
D)an object will remain at rest or keep moving in a straight line with constant speed unless a force acts on it
3.
Friction always acts __________ the direction of motion of an object. 2.d
A)opposite to
B)in the same direction as
C)perpendicular to
D)at a 45° angle to
4.
__________ measures the quantity of matter of an object. 2.d
A)Density
B)Weight
C)Net force
D)Mass
5.
The __________ is the combination of all the forces acting on an object. 2.b
A)force pair
B)inertia
C)net force
D)direction of motion
6.
When unbalanced forces act on an object, __________. 2.b
A)the net force is zero
B)the object accelerates
C)the object speeds up
D)friction becomes greater than the net force
7.
When balanced forces act on an object, the net force is __________. 2.c
A)zero
B)positive
C)negative
D)increased due to friction
8.
In describing the acceleration given a 2-kg object by a 10-N force acting on it, which of these units is appropriate? 2.f
A)N
B)m/s2
C)N/kg2
D)kg/s2
9.
The two forces of a force pair are called the __________ force and the __________ force. 2.e
A)gravitational, accelerator
B)increasing, decreasing
C)action, reaction
D)mass, acceleration
10.
Which of the following types of friction keeps an object at rest? 2.d
A)mobile
B)rolling
C)sliding
D)static
11.
A(n) __________ is a push or a pull. 2.a
A)velocity
B)acceleration
C)force
D)motion
12.
Forces that cancel each other are called __________ forces. 2.c
A)neutral
B)balanced
C)inactivated
D)null
13.
__________ is a force that resists motion between two surfaces that are in contact. 2.d
A)Acceleration
B)Friction
C)Inertia
D)Resistance
14.
__________ is the pull that all objects exert on each other. 2.d
A)Friction
B)Inertia
C)Gravity
D)Resistance
15.
Which of the following is not an acceleration? 2.e
A)riding your bike faster when you head down a hill
B)stopping your bike at an intersection
C)slowing your bike ride so you can make it up a hill
D)riding your bike straight down the street at a constant speed
16.
A change in motion is described by __________. 2.e
A)speed
B)inertia
C)net force
D)acceleration
17.
A ball is thrown straight up in the air. According to Newton's first law of motion, what is the reason for the ball falling back to Earth? 2.b
A)A force has acted on it.
B)It is accelerating in the same direction as Earth's gravitational force on it.
C)The change in the ball's acceleration is proportional to the force acting on it.
D)The ball exerts a force on the air surrounding it.
18.
Newton's third law of motion states that __________. 2.e
A)the force on an object can be found by dividing its mass by its acceleration
B)an object will remain at rest or keep moving in a straight line with constant speed unless a force acts on it
C)acceleration is calculated by dividing the force exerted on an object by the mass of the object, and that when a force acts on an object, its acceleration is in the same direction as the force
D)when a force is applied on an object, there is an equal force applied by the object in the opposite direction
19.
The strength of the gravitational force between two objects depends on which of the following? 2.d
A)the mass of the larger object
B)the velocities of the objects
C)the mass of the objects and the distance between them
D)the orbits of the objects
20.
Newton's first law of motion states that __________. 2.b
A)when a force is applied on an object, there is an equal force applied by the object in the opposite direction
B)acceleration is calculated by dividing the force exerted on an object by the mass of the object
C)when a force acts on an object, its acceleration is in the same direction as the force
D)an object will remain at rest or keep moving with a constant velocity unless a force acts on it
Grade 8
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