Unit 2 Chapter 4

Use Figure 1 to answer the question. 

One student on the swing is not in motion.  Which statement best explains why the student is not moving?

• The forces are unbalanced and there is a net force of zero.

• The forces are unbalanced and there is a net force of one.

• The forces are balanced and there is a net force of one.

• The forces are balanced and there is a net force of zero.

Two people are pushing with the same amount of force in opposite directions. Which statement best describes the effect of the forces on the object?

• The object will not move because the forces are balanced.

• The object will move in only one direction because the forces are unbalanced.

• The object will not move because the forces are unbalanced.

• The object will move because the forces are balanced.

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Use Figure 2 to answer the following questions.

Part A: What forces are being exerted on the book?  Choose 2.

• Touching force

•  Chemical reaction

•  Gravity

• Magnetic force

•  Non-touching force

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Two forces are being exerted on the book.

   What evidence supports your claim?  Choose 2.

• Magnets can attract or repel objects.

• Chemical reactions can change matter.

• Gravity pulls objects to Earth.

• Touching forces can keep objects from moving.

• Non-touching forces keep objects moving. 

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  In the figure, if the book is not moving, we can say that the forces are ______.

• Unbalanced

• Touching

• Balanced

• Non-touching

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 Which statement is the best example of a stable object?

•  A child swimming in a pool.

•  Your desk in the classroom.

•  A bird flying through the sky

•  A horse running in a race.

What does it mean for two forces on an object to be balanced?

• They are unequal in strength. They act on the object in opposite directions.

• They are equal in strength. They act on the object in the same directions.

• They are unequal in strength. They act on the object in the same directions.

•  They are equal in strength. They act on the object in opposite directions.

Which claim is NOT true about the floating paperclip experiment?

•  Unbalanced forces can make an object be stable and not change.

• Magnetic force and gravity can be balanced forces if they are exerted in different directions.

• The paperclip floated and was stable because of balanced forces.

•  The paperclip floated because gravity and magnetic force were balanced forces

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 Using the diagram, which set of balanced forces keep the Bay Bridge stable? 

• Downward force and gravity

• Upward force and magnetic force

• Upward force and gravity

• Downward force and magnetic force

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 Chart A shows the balanced forces from the floating paper clip experiment.   Using Chart A, Chart B and your knowledge of science, which two statements best explain what happened to the paperclip in Chart B?  Choose 2

•  Nothing, the paperclip kept floating.

•  The magnetic force of the magnet was stronger than gravity.

•   The paperclip fell and was no longer floating.  

• The magnet was not strong enough to make the paperclip float.

• The gravity of Earth was not strong enough.

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