Georgia Science Grade 8

Chapter 11: Force and Newton's Laws

CRCT Practice

1
Which description of gravitational force is not true?
A)It depends on the mass of objects.
B)It is a repulsive force.
C)It depends on the distance between objects.
D)It exists between all objects.
2
Which object would have an acceleration of 0.89 m/s2 if you pushed on it with a force of 0.55 N?

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A)book
B)can
C)ruler
D)stapler
3
Which object would have the greatest acceleration if you pushed on it with a force of 8.2 N?

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A)can
B)stapler
C)ruler
D)book
4
What is the weight of a book that has a mass of 0.35 kg?
A)0.036 N
B)3.4 N
C)28 N
D)34 N
5
If you swing an object on the end of a string around in a circle, the string pulls on the object to keep it moving in a circle. What is the name of this force?
A)inertial
B)centripetal
C)resistance
D)gravitational
6
What is the acceleration of a 1.4-kg object if the gravitational force pulls downward on it, but air resistance pushes upward on it with a force of 2.5 N?
A)11.6 m/s2, downward
B)11.6 m/s2, upward
C)8.0 m/s2, downward
D)8.0 m/s2, upward
7
The figure above shows the horizontal forces that act on a box that is pushed from the left with a force of 12 N. What force is resisting the horizontal motion in this illustration?

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A)friction
B)gravity
C)inertia
D)momentum
8
What is the acceleration of the box?

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A)27 m/s2
B)4.8 m/s2
C)4.3 m/s2
D)0.48 m/s2
9
An ice skater is moving in a straight line with constant speed. Which describes the forces acting on the skater?
A)The forces on the skater are unbalanced.
B)The forces on the skater are balanced.
C)There are no forces acting on the skater.
D)Only gravity is acting on the skater.
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