Indiana Science Grade 8

Chapter 8: Newton’s Laws of Motion

Standardized Test Practice

1.
Sound travels a distance of 1.50 m through a material in 0.00450 s. According to the table, what is the material?

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A)air
B)iron
C)water
D)wood
2.
Through which material would sound travel about 6.9 m in 0.0018 s?

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A)air
B)iron
C)water
D)wood
3.
The gravitational force between two rolling balls depends on their masses and which other factor?
A)their inertia
B)their velocities
C)their separation
D)their weights
4.
About how long would it take a person to walk a distance of 8.5 km at a speed of 2.9 km/h?
A)2.5 h
B)3.2 h
C)2.9 h
D)3.4 h
5.
What is the difference in the force of gravity on Earth between an object with a mass of 17.3 kg and an object with a mass of 21.9 kg?
A)0.47 N
B)45 N
C)2.1 N
D)4.6 N
6.
What is the displacement of a hiker who walks along the path shown from Start to Finish and back again?

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A)12 km
B)0 km
C)24 km southeast
D)44 km southeast
7.
A 1.8-N force causes a toy sailboat to move along the water with an acceleration of 0.12 m/s2. What is the mass of the sailboat?
A)0.22 kg
B)1.3 kg
C)15 kg
D)6.7 kg
8.
What force makes it harder to start a desk moving than to push the desk across the floor?
A)inertia
B)rolling friction
C)static friction
D)sliding friction
9.
A person pushes against a 9.2-kg box with a force of 11.5 N. The frictional force on the box is 2.1 N. What is the acceleration of the box?
A)0.86 m/s2
B)0.92 m/s2
C)1.0 m/s2
D)1.3 m/s2
10.
A train moves along a straight section of track at a velocity of 82 km/h east. A person walks toward the back of the train with a velocity of 2 km/h west. What is the velocity of the person relative to the ground?
A)80 km east
B)80 km west
C)84 km east
D)84 km west
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