Indiana Science Grade 8

Chapter 8: Newton’s Laws of Motion

Section 2 Self-Check Quiz-Eng.

1.
A __________ is a push or a pull.
A)force
B)motion
C)velocity
D)acceleration
2.
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)It is accelerating in the same direction as Earth's gravitational force on it.
B)The change in the ball's acceleration is proportional to the force acting on it.
C)The ball exerts a force on the air surrounding it.
D)A force has acted on it.
3.
The SI unit for force is the __________.
A)pound
B)kilogram
C)newton
D)mass number
4.
Newton's first law of motion states that __________.
A)an object will remain at rest or keep moving at constant speed unless a force acts on it
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)when a force is applied on an object, there is an equal force applied by the object in the opposite direction
5.
__________ measures an object's tendency to resist changing its motion.
A)Gravity
B)Acceleration
C)Inertia
D)Mass
6.
Forces that cancel each other are called __________ forces.
A)neutral
B)inactivated
C)balanced
D)null
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