2nd Nine Weeks Review

At Time 1, a force of F1 is applied to the left side of a block. The block moves to the right with a constant acceleration. Then at Time 2, a smaller force, F2, is applied to the right side of the block while F1 is still being applied. What will MOST likely happen to the block at Time 2?

• It will stop completely.

• It will begin to accelerate to the left.

• It will accelerate to the right at a faster rate.

• It will continue to accelerate to the right at a slower rate.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Team 1 and Team 2 are playing a game. They want to find out which team can push a box the hardest. The players on the teams start pushing on opposite sides of the box. Both teams push with the same amount of force. What will happen?

• The box may move in either direction.

• The box will move towards Team 1.

• The box will move towards Team 2.

• The box will not move.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

What is the net force on the book in the following figure?

• 38 N to the Left

• 360 N to the left

• 2 N to the left

• 1.1 N to the left

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NGSS.MS-PS2-2

The total amount of kinetic energy (motion of atoms and molecules) in a substance is

• thermal energy.

• chemical energy.

• mechanical energy.

• electromagnetic energy.

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NGSS.MS-PS3-1

NGSS.MS-PS3-4

Which of the water samples described below has the greatest average kinetic energy per molecule?

• 1 liter of ice at a temperature of –50°C

• 10 liters of ice at a temperature of –75°C

• 1 liter of water at a temperature of 75°C

• 10 liters of water at a temperature of 50°C

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which statement describes the transfer of energy when an ice cube is placed in a cup of hot tea?

• Heat flows from the tea to the ice.

• Cold flows from the ice to the tea.

• Cold flows from the ice, and heat flows from the tea.

• Heat flows simultaneously between the ice and the tea.

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NGSS.MS-PS1-4

Which of the following explains how someone could increase the average kinetic energy of particles within a glass of water?

• Increase the amount of water in the glass, because increasing the amount of a substance increases the kinetic energy of the particles

• Add ice into the water, because when a solid and a liquid mix, the kinetic energy of particles increases.

• Decrease the amount of water in the glass, because decreasing the amount of a substance concentrates the kinetic energy.

• Heat the water in a microwave, because as temperature increases, the kinetic energy of particles increases.

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NGSS.MS-PS1-4

NGSS.MS-PS3-5

Peter is investigating how thermal energy is transferred when he takes food out of the refrigerator. Which statement describes how he could collect data to explain this and what the expected result would be?

• Measure how long it takes the food to reach the same temperature as the interior of the refrigerator. The food will likely gain thermal energy from the cold refrigerator and decrease in temperature until it is the same temperature as the refrigerator.

• Measure the temperature of the refrigerator and the air, and time how long the food is out of the refrigerator for. The cold food will likely gain thermal energy from the warmer air and increase in temperature until it is a little warmer than the air.

• After taking the food out of the refrigerator, measure the temperature of the food at even time intervals. The cold food will likely gain thermal energy from the warmer air and increase in temperature until it is the same temperature as the air.

• Measure the temperature in the food when it is taken out of the refrigerator at various time intervals. The cold food will likely lose thermal energy to the warmer air and increase in temperature until it is the same temperature as the air.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What would you expect to happen to the gas inside a sealed container when the temperature drops, and why?

• The particles would spread out more because decreasing the temperature causes the particles to have more kinetic energy.

• The particles would spread out more because decreasing the temperature causes the particles to have less kinetic energy.

• The particles would move faster because decreasing the temperature causes the particles to have more kinetic energy.

• The particles would move more slowly because decreasing the temperature causes the particles to have less kinetic energy.

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NGSS.MS-PS1-4

A woman is walking along a beach and notices that the sand in the sun is much hotter than the sand in the shade. This means the particles that make up the sand in the sun have ______ kinetic energy than the particles in the sand in the shade, so they are ______.

• less, moving faster

• more, moving faster

• more, moving slower

• less, moving slower

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5