Answers TN-Physical Science SC 26-27 For CreditNewton's Laws of Motion

Newton's Laws of Motion — Unit test Answers

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Action and reaction forces are described by which of Newton’s laws of motion?

first

second

third

fourth

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Juan inflates a balloon and then releases its end to let the balloon go free as air comes out. The balloon then flies around the room.

According to Newton’s first law of motion, the balloon would stay still unless a force caused it to move.

According to Newton’s third law of motion, the balloon is pushed forward as the air is forced out.

According to Newton’s third law of motion, the balloon resists any change of motion unless an unbalanced force acts upon it.

According to Newton’s second law of motion, the balloon exerts a force on the air, which exerts a force back on the balloon.

Increasing which factor will cause the gravitational force between two objects to decrease?

weights of the objects

distance between the objects

acceleration of the objects

masses of the objects

The diagram shows two balls before they collide.

0.0 kg • m/s

0.2 kg • m/s

0.3 kg • m/s

0.4 kg • m/s

Which describes an object in projectile motion?

Gravity acts to push the object sideways.

The object moves in a straight path.

The forward velocity of the object is 0 m/s.

The object’s inertia carries it forward.

Ana exerts a force of 20 N on a volleyball that has a mass of 0.15 kg. What is the force that the volleyball exerts on Ana?

0.15 N

20 N

19.85 N

20.15 N

A 50 kg pitcher throws a baseball with a mass of 0.15 kg. If the ball is thrown with a positive velocity of 35 m/s and there is no net force on the system, what is the velocity of the pitcher?

−0.1 m/s

−0.2 m/s

−0.7 m/s

−1.4 m/s

Denise is riding her bike and falls to the ground. During the collision, she hits both grass and cement.

The grass did not exert a reaction force.

The grass did not exert an action force.

The grass shortens the time of the collision.

The grass extends the time of the collision.

The chart shows masses and velocities of four objects.

W, X, Y, Z

Z, Y, X, W

Z, X, W, Y

Y, W, X, Z

Momentum is a measure of the ________ of an object.Which term accurately completes the sentence?

mass

motion

force

weight

Why are objects that fall near Earth’s surface rarely in free fall?

Gravity does not act on objects near Earth’s surface.

Air exerts forces on falling objects near Earth’s surface.

The objects do not reach terminal velocity.

The objects can be pushed upward by gravity.

The chart show the masses and velocities of two colliding objects that stick together after a collision.

4,500 g · m/s

1,750 g · m/s

1,500 kg · m/s

3,000 kg · m/s

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Newton's Laws of Motion — Unit test Answers

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