Contact & non-contact forces

10. A ball rolls down from the top of a grassy hill, reaches the bottom of the hill, continues to roll, and then starts to slow down and comes to a stop. What forces caused this ball's motion?

• Frictional force caused the ball to roll down the hill, but air resistance caused the ball to slow down and stop.

• Magnetic force caused the ball to roll down the hill, but gravity caused the ball to slow down and stop.

• The force of the hill caused the ball to roll down it, but gravity caused the ball to slow down and stop.

• Gravity caused the ball to roll down the hill, but frictional force caused the ball to slow down and stop.

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7.Luis rubbed a balloon on his hair and held the balloon next to a faucet trickling water. He observed that as the balloon was placed close to the water, the stream of water appeared to “bend” to move out of the way. Which of the following forces is responsible for the stream of water moving away from the balloon?

• Gravity

• Magnetism

• Friction

• Electric

What is gravity?

• A force
• Energy
• A push
• All of them

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Who is the scientist that studied gravity a long time ago? (He apparently got an apple falling on his head)

• Albert Einstein
• Isaac Newton
• Charles Darwin
• Stephen hawkins

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What is the difference between weight and mass?

• Mass is ignorant of direction. On the other hand, weight is a vector quantity; it is direction-aware.
•  there isn't much of a change between the two.
• Biiiiiig difference, but I'm not sure what it is.
• mass is the actual amount of material contained in a body and weight is the force exerted by the gravity.

What keeps the planets in orbit around the sun?

• gravity

• friction

• density

• distance

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Which statement about gravity is true?

• gravity causes objects to pull towards one another

• gravity causes objects to push away from each other

• gravity only takes place between planets

• the moon doesn't have any gravity

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How is weight different from mass?

• Weight is the measure of the pull of gravity on an object, and mass is the amount of matter in an object.

• Weight is the amount of matter in an object, and mass is the measure of the pull of gravity on an object.

• Weight is the measure of the pull of gravity on an object, and mass is the amount of space that an object fills.

• Weight and mass are no different from each other.

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The rougher the surface, the faster an object will travel over the surface.

• True
• False

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Which objects have a STRONG force of gravity?

• Objects with GREATER mass, like elephants
• Objects with LESS mass, like mice

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