Types of Forces Test Review

Destiny took an inflated balloon and moved it back and forth across a wool cloth. In doing so she was able to charge the balloon with static electricity. Once she was done, she turned on the sink to have a slow stream of water. She then moved the balloon towards the water, causing the stream of water to move away from the balloon. Which of the following best describes the types of forces present in this scenario?

• All the forces that are present when moving the balloon provide examples of contact forces.

• All the forces that are present when moving the balloon provide examples of non-contact forces.

• Moving a balloon across a wool cloth is an example of a contact force and the static electricity on the balloon is an example of a non-contact force.

• Moving a balloon across a wool cloth is an example of a non-contact force and the static electricity on the balloon is an example of a contact force.

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A rolling ball will slow down until it finally stops. What force slows down and stops the ball?

• gravity

• solar power

• friction

• speed

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The picture above shows a waterfall.

What is the primary force responsible for the motion of the water over the sloping ground, and how does this force affect the water?

• The force of air resistance, because it pushes the water downward

• The fore of friction, because it applies a downward pulling force on the water.

• The force of magnetism at the Earth's core, because it pushes the water downward.

• The force of gravity, because it applies a downward pulling force on the water along the sloping land.

Which sentence below describes a contact force?

• A baseball bat hits a baseball

• A book falls to the floor

• A leaf floats in the air and falls to the ground.

• A magnetic force pulls a paper clip toward a magnet

An Orange falls off a tree and lands on the ground. What force caused the orange to fall?

• friction

• heat

• gravity

• wind

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A 10 kg, 15 kg, and 20 kg rock are rolling down a hill. Which rock will require the most force to stop?

• 10 kg rock

• 15 kg rock

• 20 kg rock

• All 3 rocks will require the same force

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Brittany has a bar magnet. What will happen when she brings the north end of her magnet to the south end of her magnet?

• They will attract

• Nothing will happen

• They will repel

• Sparks will fly

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The students in Mrs. Hoffman’s class played tug-of-war. The girls pulled in one direction with a force of

150 N. The boys pulled in the opposite direction with a force of 100 N. Who won the game and why did they win?

• The boys won because they applied a stronger force to the

  rope

• The boys and the girls tied because they applied equal

  forces to the rope

• The girls won because they applied a stronger force to the

  rope

• Too much force was applied, the rope broke

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Which is the following is NOT a non-contact force?

• Applied force

• Gravitational force

• Electrical force

• Magnetic force

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William used a hammer to pound a nail into a wooden board. When the nail was about halfway through the board, he stopped and turned the board upside down. The nail stayed in place in the board. Which of the following acts on the nail to keep it in place in the board?

• Friction

• Gravity

• Magnetism

• Weight

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