Focus On Physical Science: California Grade 8

Lesson 3: Unbalanced Forces and Acceleration

Standards Check

1.
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)kg/s2
B)N
C)N/kg2
D)m/s2
2.
Newton's third law of motion states that __________. 2.e
A)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
B)an object will remain at rest or keep moving in a straight line with constant speed unless a force acts on it
C)when a force is applied on an object, there is an equal force applied by the object in the opposite direction
D)the force on an object can be found by dividing its mass by its acceleration
3.
The two forces of a force pair are called the __________ force and the __________ force. 2.e
A)increasing, decreasing
B)action, reaction
C)gravitational, accelerator
D)mass, acceleration
4.
Newton's second law of motion states that __________. 2.f
A)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
B)the force on an object can be found by dividing its mass by its acceleration
C)when a force is applied on an object, there is an equal force applied by the object in the opposite direction
D)an object will remain at rest or keep moving in a straight line with constant speed unless a force acts on it
5.
A change in motion is described by __________. 2.e
A)net force
B)inertia
C)acceleration
D)speed
6.
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)1.8 N
B)18 N
C)35.5 N
D)72 N
7.
Which of the following is not an acceleration? 2.e
A)riding your bike straight down the street at a constant speed
B)stopping your bike at an intersection
C)slowing your bike ride so you can make it up a hill
D)riding your bike faster when you head down a hill
Grade 8
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