MS PS2-4 Review

When astronauts walked on the Moon, they used weighted boots to help them walk due to the lower gravitational pull. What difference between Earth and the Moon accounts for the difference in gravity?

• density

• diameter

• mass

• volume

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Which pair of objects has the greatest gravitational force between them?

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• 
• 
• 

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The weight of an object can change even when the mass stays the same. Which statement correctly identifies a relationship between mass and weight?

• The weight of an object depends on its mass and its volume.

• Gravity affects the weight of an object but not its mass.

• The mass of an object depends on its weight and size.

• Magnetic fields can affect mass but not weight.

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A student drops a bowling ball and an apple from a third-story window. Both objects hit the ground at the same time. From the experiment the student should conclude that

• the apple weighs more than the bowling ball.

• the bowling ball speeds up faster than the apple.

• more air friction is acting on the apple than on the bowling ball.

• gravity pulls on both objects, causing them to fall at the same rate.

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Which example best illustrates an action-at-a-distance force?

• lifting a box

• an apple falling

• pulling a nail out of wood

• a car moving along a flat surface

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What is the relationship between mass and gravitational pull?

• Lower gravitational pull creates more mass.

• Higher gravitational pull creates more mass.

• Lower mass creates higher gravitational pull.

• Higher mass creates higher gravitational pull.

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Amanda weighs about 600 N on Earth, but would only weigh about 100 N on the Moon. Which best explains why Amanda would weigh less on the Moon than on Earth?

• The pull from the gravity from Earth decreases the pull of gravity from the Moon.

• The circumference of the Moon is smaller than Earth, therefore it has less gravity.

• The lack of air pressure on the Moon weakens the gravitational force of the Moon.

• The mass of the Moon is less than that of Earth, therefore it has a weaker gravitational force.

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The force of gravity would be greatest between which of the following?

• two cars two meters apart

• two bricks two meters apart

• a brick and a car one meter apart

• a brick and a pencil two meters apart

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Less force is required to launch a spaceship from the surface of the Moon than to launch an identical ship from the surface of Earth because

• the Moon has a smaller surface area than Earth.

• the mass of an object on Earth is greater than on the Moon.

• the gravitational field of the Moon is less than that of Earth.

• the atmosphere of the Moon is much thinner than that of Earth.

Which of these will result in the least gravitational attraction?

• two 2-gram objects 2 meters apart

• two 2-gram objects 4 meters apart

• two 1-gram objects 6 meters apart

• two 1-gram objects 8 meters apart

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