7th grade Science Review #1

Two students pull on a rope in opposite directions, each with a force of 100 N. What would most likely happen to the rope if the student on the left increased her force to 125 N?

• The rope would decrease its acceleration to the left.

• The rope would decrease its acceleration to the right.

• The rope would go from motionless to accelerating to the left.

• The rope would go from accelerating to the right to accelerating to the left.

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The diagram above shows the motion of a ball while being dropped. What happens to the energy of the ball from when t = 0 s to when t = 5 s?

• Potential energy decreases and kinetic energy increases, but the total amount of mechanical energy remains the same.

• Potential energy increases and kinetic energy decreases, but the total amount of mechanical energy remains the same.

• Potential energy and kinetic energy both increase, and the total amount of mechanical energy increases.

• Potential energy and kinetic energy both decrease, and the total amount of mechanical energy decreases.

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In which way are a euglena and a volvox different?

• A euglena is an individual cell, while a volvox is a colony of cells.

• A euglena uses cilia to move, while a volvox uses flagella to move.

• A euglena can make its own food, while a volvox must capture its food.

• A euglena only reproduces sexually, while a volvox only reproduces asexually.

Which is the most likely cause of tropical storms?

• Water runoff from the land fuels storm clouds.

• High-pressure air causes storm clouds to form.

• Sea breezes close to shore push storm clouds together.

• Warm water evaporates, rises quickly, and interacts with a colder air mass.

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Which layer of the atmosphere contains the most water vapor?

• troposphere

• stratosphere

• mesosphere

• exosphere

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Person X and person Y both smoked the same brand and amount of cigarettes for 20 years. Person Y develops lung disease while person X does not. Which statement best compares both people?

• Person X is a man and thus more likely to develop lung disease.

• The genetic makeup of person X allowed for a higher tolerance to chemicals in tobacco than person Y.

• Person X is a woman and thus more likely to develop lung disease.

• The genetic makeup of person X allowed for a lower tolerance to chemicals in tobacco than person Y.

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The diagram below shows four different objects that all start at the same place and move along the same path.

Which best describes the motion of these objects?

• Both Objects 2 and 3 are at a higher elevation than Object 1.

• Both Objects 1 and 2 are at a lower elevation than Object 4.

• Object 4 has traveled farther than the other objects.

• Object 1 has traveled farther than the other objects.

Which will cause an increase in the mechanical energy of an object?

• decreasing its kinetic energy

• increasing its electrical energy

• increasing its potential energy

• decreasing its gravitational energy

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The diagram below shows the path of a marble.

At which position does the marble have the most kinetic energy?

• 1

• 2

• 3

• 4

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This is a diagram of four simple machines.

Which simple machine would most likely be used to move an object over great distances and on a flat surface?

• R

• S

• T

• U

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