Motion and Stability Review

The picture shows a flying chair ride. The chairs are suspended from a spinning disc, which moves up and down along a column in the center. The ride runs for 3 minutes. The disc completes one up and down cycle every 45 seconds. How many complete up and down cycles will occur during a single ride?

• 3 complete cycles

• 4 complete cycles

• 5 complete cycles

• 6 complete cycles

A teenager is riding on a swinging pirate ship ride at an amusement park. The table shows data on the position of the teenager during a portion of the ride. If the pattern continues, which of the following most likely describes the teenager’s position at 15 seconds?

• Point A

• Point B

• Point C

• None of the above

An adult drops a barbell on a smooth gym floor. It begins rolling toward a glass mirror. Which of the following would be necessary to change the direction of the rolling barbell?

• A magnetic force

• A balanced force

• A gravitational force

• An unbalanced force

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NGSS.MS-PS2-2

Which of the following events is most likely caused by the force of gravity?

• A breeze moves a piece of trash across a parking lot.

• A puddle of water evaporates on a warm day.

• A coin is flipped into the air, then falls toward the ground.

• A campfire warms the skin of a person sitting nearby.

The picture shows some forces acting on a hawk as it takes off from the ground. Which arrow represents the force of gravity?

• 1

• 2

• 3

• 4

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NGSS.MS-PS2-4

A snowboarder stands along the upper edge of a half-pipe, and quickly glides down to the center. As she approaches the opposite edge, her motion slows, and she begins to move toward the center again. Why does the snowboarder never reach the top of the opposite edge?

• The force of gravity pulls her back toward Earth’s center.

• The mass of the snowboarder pulls her away from Earth’s center.

• The force of gravity pulls her away from Earth’s center.

• The force of the snowboarder pulls her toward Earth’s center.

Tags

NGSS.MS-PS2-4

Two identical objects are dropped at the same time, one in the Northern Hemisphere, and the other in the Southern Hemisphere. Which of the following accurately describes the effect of gravity on the two objects?

• Both objects are drawn toward Earth’s center by Earth’s gravity.

• Both objects are drawn away from the Earth’s center by Earth’s gravity.

• The object in the Northern hemisphere is drawn toward Earth’s center by Earth’s gravity, while the object in the Southern Hemisphere is drawn away.

• The object in the Southern hemisphere is drawn toward Earth’s center by Earth’s gravity, while the object in the Northern Hemisphere is drawn away.

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NGSS.MS-PS2-2

NGSS.MS-PS2-4

Which of the following statements most accurately describes why the moon orbits Earth?

• The moon is repelled by the mass of Earth’s neighboring planets, Venus and Mars.

• The moon orbits Earth because the force of gravity causes the mass of the moon to be attracted to the mass of Earth.

• The air currents in space cause winds to circulate around the moon and Earth, pushing the moon toward Earth.

• Because there is no water on the moon, its dry surface is pulled in by the moisture in Earth’s atmosphere.

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NGSS.MS-ESS1-1

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Which of the following statements most accurately describes why an object weighs more on Earth than on the moon?

• The moon has more mass than the Earth, so its magnetic field is stronger.

• The moon has more mass than the Earth, so it has a stronger gravitational pull.

• The Earth has more mass than the moon, so its magnetic force is weaker.

• The Earth has more mass than the moon, so it has a stronger gravitational pull.

Tags

NGSS.MS-PS2-4

A child is shown jumping on a trampoline. No matter how high the child jumps, they will always land because:

• inertia pulls the child down.

• the force of gravity pulls the child down.

• a magnetic force pulls the child down.

• air resistance pushes the child down.

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NGSS.MS-PS2-2

NGSS.MS-PS2-4