Newton's Laws and Balanced Forces Review

A mother and daughter press their hands together then push apart while ice skating.

Immediately after they push away from each other, how does the motion of the mother and daughter change?

• Both move backward, but the daughter moves with a greater acceleration.

• The mother moves forwards, and the daughter moves backward with a greater acceleration.

• Both move forward but the mother moves with a greater acceleration.

• The mother moves backwards, and the daughter moves forwards with a greater acceleration.

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A large rock is motionless on a flat sidewalk. Which statement best explains why the
rock remains motionless.

• There are no forces acting on the rock.

• The only force acting on the rock is directed towards the sidewalk.

• The forces acting on the rock are all balanced.

• The sidewalk exerts an unbalanced force on the rock

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In the diagrams below, two forces are

exerted on an object. The forces are

represented by arrows. The length of

the arrow indicates the magnitude of

the force. In which of the diagrams

will the motion of the object remain

unchanged?

• 
• 
• 
• 

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A sheet of notebook paper lying

motionless on a table and not

touched by an outside force will

MOST likely remain motionless

because —

• balanced forces exerted by

  gravity and the table keep the

  paper motionless

• an unbalanced force is exerted

  by the table to keep the paper

  motionless

• balanced forces exerted by

  gravity and the air keep the

  paper motionless

• an unbalanced force is exerted

  by the air to keep the paper

  motionless

The graphs show the motion of four different objects. Each object moved in a single direction during the time period shown in the graph. Which of the objects were acted on by unbalanced forces?

• objects B, C, and D only

• objects B and D only

• object B only

• object A only

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Name the missing force....

• weight force

• normal force

• frictional force

• tension force

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This game of tug of war is an example of _________ forces.

• unbalanced

• balanced

• potential

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How does Newton's Second Law apply when Charlotte pushes an empty shopping cart versus when Ethan pushes a full one?

• The empty cart requires more force to accelerate than the full one.

• The full cart accelerates more easily because it has more mass.

• The empty cart accelerates more easily because it has less mass.

• Newton's Second Law does not apply to shopping carts.

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How does Newton's Second Law apply when you push an empty shopping cart versus a full one?

• The empty cart requires more force to accelerate than the full one.

• The full cart accelerates more easily because it has more mass.

• The empty cart accelerates more easily because it has less mass.

• Newton's Second Law does not apply to shopping carts.

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True or False: this person and shopping cart CANNOT be moving.

• True

• False

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