Contact and Non-Contact Forces

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

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8.If a spring is attached to two boards with one board at each end of the spring, and the two boards are pulled far apart to stretch the spring, what force will the spring exert in response?

• It will sag between the two boards.

• It will pull the two boards toward each other

• It will hold the boards steady in one place

• It will spin the boards in opposite directions

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9. Imagine two planets,

Planet A and Planet B, in a distant galaxy. Both planets have the same size, but Planet A has more mass than Planet B. Suppose two identical alien space vehicles land on each planet. Which of the following statements is true?

• The weight of the space vehicle is greater on Planet A, but the vehicle’s masses are the same on both planets.

• The mass of the space vehicle is greater on Planet A, but the vehicle’s weights are the same on both planets.

• Both the mass and weight of the space vehicle are greater on Planet A.

• Both the mass and weight of the space vehicle are the same on both planets.

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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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11. Gordon is making a list of forces for his science class. Which of the following should Gordon NOT list as a force?

• gravity

• friction

• a push or pull

• mass

12. On the moon, a bag of sugar has a weight of 3.7 Newtons (N) and a mass of 2.26 kilograms (kg). Which of the following describes the mass of the sugar on Earth?

• more than its mass on the Moon

• same as its mass on the Moon

• less than its mass on the Moon

• same as is weight on the Moon

13. Some forces require direct contact, while others, like gravity, act at a distance. Which of the following is NOT influenced by gravity?

• Earth's tides

• your weight

• Earth's Orbit

• magnetism

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14. Ignoring mass and weight contributed by fuel, what happens when the space shuttle takes off and moves away from Earth?

• Its mass decrease and weight increases

• Its mass increases and weight decreases

• Its mass remains constant and weight decreases

• Its mass remains constant and weight increase

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15. Gravity is a force that every mass exerts on every other mass. When you jump up in the air, not only does the Earth exert a gravitational force on you, but you also exert a gravitational force on the Earth. You, of course, fall back down to the Earth. Which of the following explains why the Earth is not moving toward you when you jump up in the air?

• Earth exerts a gravitational force on itself.

• You don’t weigh enough to affects Earth’s surface.

• Your mass is very small compared to Earth’s mass.

• Earth’s fixed orbit around the Sun keeps it from moving

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16. If Earth's mass was cut in half, what would happen to your mass?

• increase because gravitational force increases

• decrease because gravitational force increases

• decrease because gravitational force decreases

• nothing, mass is not affected by gravitational force

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