How does the mechanical energy of a rock change as it falls from a mountain?
The mechanical energy remains the same because potential energy is changed into kinetic energy.
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15
Over a period of several hours, a barometer shows rapidly decreasing air pressure. What type of weather will most likely occur next?
calm, windless weather
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monster
Reset all scores!
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star
Double points!
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gift
Win 15 points!
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thief
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15
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 go from motionless to accelerating to the left.
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trap
No points!
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fairy
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fairy
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banana
Go to last place!
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15
Why are scientists concerned with ozone depletion in the upper atmosphere?
because it allows ultraviolet radiation to reach Earth's surface
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15
Which best explains why muscle is considered a tissue?
It is a group of cells working together.
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15
How is a gamete different from other types of cells in a person's body?
It has half the number of chromosomes.
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15
How do people determine if a vehicle in which they are sitting is moving?
by comparing their position to a fixed object outside the vehicle.
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15
A person enters a room, flips the light switch, and a lamp turns on. What causes the lamp to turn on?
The circuit is open, and flipping the switch closes the circuit.
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15
Which applied force will cause a glass of water sitting on a countertop to move?
an unbalanced force
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15
How do a volvox and an amoeba get their food?
A volvox uses photosynthesis, and an amoeba surrounds its food.
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15
How do the digestive system and the circulatory system work together in the human body?
The digestive system extracts nutrients from food, while the circulatory system transports those nutrients.
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baam
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fairy
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gift
Win 15 points!
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banana
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15
In which way are a euglena and a volvox different?
A euglena is an individual cell, while a volvox is a colony of cells.
