Indiana Science Grade 8

Chapter 8: Newton’s Laws of Motion

Newton’s Laws of Motion

1.
In describing the acceleration given to a 2-kg object by a 10-N force acting on it, which of these units is appropriate?
A)N/kg[superscript 2]
B)m/s[superscript 2]
C)N
D)kg/s[superscript 2]
2.
A(n) __________ is a push or a pull.
A)motion
B)acceleration
C)velocity
D)force
3.
If a car is traveling 100 km/h and comes to a stop in 3 min, what is the car's acceleration?
A)0.15 m/s[superscript 2]
B)0.56 m/s[superscript 2]
C)- 0.15 m/s[superscript 2]
D)- 0.56 m/s[superscript 2]
4.
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?
A)The ball exerts a force on the air surrounding it.
B)A force has acted on it.
C)The change in the ball's acceleration is proportional to the force acting on it.
D)It is accelerating in the same direction as Earth's gravitational force on it.
5.
Forces that cancel each other are called __________ forces.
A)neutral
B)balanced
C)null
D)inactivated
6.
The SI unit for force is the __________.
A)newton
B)pound
C)mass number
D)kilogram
7.
Which of the following statements is true?
A)Weight can change when acceleration due to gravity changes.
B)Weight is a measure of inertia.
C)Weight is the measure of the amount of matter in an object.
D)Mass is a force.
8.
__________ is a force that resists motion between two surfaces that are in contact.
A)Friction
B)Acceleration
C)Inertia
D)Resistance
9.
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?
A)1.8 N
B)35.5 N
C)72 N
D)18 N
10.
If a runner maintains a constant speed of 12 km/h, how long will it take him to complete a marathon race of 26.2 miles?
A)3.52 h
B)3.14 h
C)2.18 h
D)5.3 h
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