North Carolina Science Grade 7

Chapter 13: Force and Newton's Laws

Force and Newton’s Laws

1.
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 change in the ball's acceleration is proportional to the force acting on it.
B)It is accelerating in the same direction as Earth's gravitational force on it.
C)A force has acted on it.
D)The ball exerts a force on the air surrounding it.
2.
The __________ is the combination of all the forces acting on an object.
A)inertia
B)force pair
C)net force
D)direction of motion
3.
A __________ is a push or a pull.
A)force
B)motion
C)velocity
D)acceleration
4.
Newton's first law of motion states that __________.
A)when a force is applied on an object, there is an equal force applied by the object in the opposite direction
B)an object will remain at rest or keep moving with a constant velocity unless a force acts on it
C)acceleration is calculated by dividing the force exerted on an object by the mass of the object
D)when a force acts on an object, its acceleration is in the same direction as the force
5.
Which of the following statements is true?
A)Velocity of a moving object is the distance traveled divided by the time needed to travel the distance.
B)When speed increases gradually, average speed and instantaneous speed are the same.
C)If a moving object slows down, it is accelerating.
D)An object does not accelerate if it turns and maintains constant speed.
6.
In describing the acceleration given a 2-kg object by a 10-N force acting on it, which of these units is appropriate?
A)m/s2
B)kg/s2
C)N/kg2
D)N
7.
The two forces of a force pair are called the __________ force and the __________ force.
A)increasing, decreasing
B)action, reaction
C)mass, acceleration
D)gravitational, accelerator
8.
When unbalanced forces act on an object, __________.
A)the object speeds up
B)friction becomes greater than the net force
C)the net force is zero
D)the object accelerates
9.
The strength of the gravitational force between two objects depends on which of the following?
A)the orbits of the objects
B)the mass of the objects and the distance between them
C)the mass of the larger object
D)the velocities of the objects
10.
Forces that cancel each other are called __________ forces.
A)inactivated
B)balanced
C)neutral
D)null
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