Physical Science Test Review

Lamark goes to a bowling alley to test his belief that rolling a bowling ball slowly will result in knocking down more pins. He gently rolls his bowling ball towards the bowling pins lined up at the end of the lane. The bowling ball stops in the middle of the lane without striking the pins. Which statement below best explains what happened?

• The ball's kinetic energy is transforming to potential energy.

• The ball needs more thermal energy to knock down the pins

• Some of the ball’s kinetic energy is transformed into sound and thermal energy.

• The chemical energy of the lane reduces the mechanical energy of the bowling

  ball.

There are many types of forces. Which statement best compares an electrical force to a gravitational force?

• Electrical forces hold small objects near each other and gravitational forces hold large objects near each

  other.

• Electrical forces depend on the type of charge and gravitational forces depend on the mass of the objects and how far apart they are.

• Electrical forces are attractions between similar types of charges and gravitational forces are attractions between similar sizes of objects.

• Electrical forces require that the objects are in contact with each other and gravitational forces require that the objects are far from each other.

What is gravitational force?

• It makes objects at rest start moving.
• It makes objects that are moving stop.
• The force of attraction between two objects.
• It pulls you into space.

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Which of the following events is caused by magnetic force?

• A person gets a shock from a doorknob after walking across carpet.

• Pieces of clothing stick together after being in a clothes dryer.

• The needle of a compass points toward Earth's North Pole.

• Objects are constantly pulled toward the center of Earth.

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Where is the strongest attraction force of the magnet?

• at the poles
• in the middle
• above the magnet
• below the magnet

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As the distance between two magnets increases (they get farther apart), the force between them:

• Increases
• Decreases
• Stays the Same

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What characteristics do magnetic substances have?

• They can give you a "shock" when you touch them
• They can push or pull objects without touching them
• They are always black and cold to touch
• They fall faster than other objects when you drop them

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If these boys are pulling with the same amount of force.  What will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

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This is an example of what kind of force?

• Balanced Force
• Pushing Force
• Gravity Force
• Unbalanced Force

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What is true about this picture?

• the forces are balanced

• the net force is 10N

• The net force is 3 N

• The net force is 7N

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