How do simple machines affect work?

• They increase the amount of force needed for work.

• They do all of the work and remove the need for force.

• They make the work harder to do by increasing the need for force.

• They change the direction or the amount of force needed for work.

Which of these things does NOT happen due to the force of gravity?

• An apple falling off of a tree

• A compass pointing north

• A book sitting on a table

• A toy car rolling down a ramp

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NGSS.5-PS2-1

How did adding wheels make the heavy piano easier to move?

• The wheels helped to increase the force of friction on the piano.

• The wheels helped to reduce the force of friction on the piano.

• The wheels helped increase the total mass of the piano.

• The wheels helped to reduce the total mass of the piano.

Both dogs are pulling the rope but they do not move. Which statement best describes the forces while the dogs are pulling but not moving?

• Max and Otto are pulling with balanced forces in opposite directions.

• Max and Otto are pulling with unbalanced forces in opposite directions.

• Max and Otto are pulling with balanced forces in the same direction.

• Max and Otto are pulling with unbalanced forces in the same direction.

Which pathway illustrates the most likely flow of energy within an aquatic ecosystem?

• Bass → Insect larvae → Algae → Minnows → Sun

• Algae → Bass → Insect larvae → Minnows → Sun

• Sun → Algae → Minnows → Bass

• Sun → Minnows → Insect larvae

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NGSS.MS-LS2-3

What is this meaning of the word "community" in science?

• All of the living things in a place

• All of the non-living things in a place

• A place where only people live

• A place where only plants live

A private landowner buys a large field in west Texas. She hires a snake catcher, who removes all the bull snakes from her property. Which of the following will most likely result?

• The number of spiders in the field will increase.

• The number of deer in the field will decrease.

• The number of mice in the field will increase.

• The number of trees in the field will decrease.

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

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How will the roots of the growing bean seed plant respond to the force of gravity?

• The roots will not grow.

• The roots will grow upward.

• The roots will continue to grow downward.

• The roots will first grow upward, then downward.

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NGSS.MS-LS1-5

What would happen to the animal populations if most of the grass in the ecosystem were killed by a long drought?

• The zebra population would increase because zebras would not have to compete with the grass for resources.

• The lion population would not be affected because lions do not eat grass to get the energy they need.

• The zebra population would decrease because zebras depend on the grass for the energy they need to survive.

• The lion population would not be affected because the lions can survive in drought conditions.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of these pictures shows a liquid turning into a gas?

• A

• B

• C

• D

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NGSS.MS-PS1-4