Problem:OPTIONS:
- other planets
- magnets
- wind
- gravitational pull
- flow of electrons
- It gets heated up
- heat energy
- energy of moving objects

Fact 1: The mass of a planet causes the pull of gravity on that planet. Fact 2: Gravity accelerates mass. Given the two facts above, what causes a planet to accelerate?
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A: gravitational pull

Problem:OPTIONS:
- electricity
- satellites
- air
- phytoplanktons
- unidirectional
- telephones
- the Sun
- waves

Fact 1: Telephones are used for communication by two people by transmitting sound. Fact 2: Loudspeakers then turn the signals into sounds. Given the two facts above, what are used for communication by two people by transmitting signals?
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A: telephones

Problem:OPTIONS:
- heat energy
- minerals
- water
- movement
- Energy.
- natural gas
- heat
- energy

Fact 1: Agasoline lawn mower converts gasoline into motion. Fact 2: Range of motion is the natural distance and direction of movement of a joint. Given the two facts above, what does a gasoline lawn mower convert gasoline into?
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A: movement

Problem:OPTIONS:
- energy
- unidirectional
- mechanical
- thrust
- waves
- rays or beams
- direct energy
- adding heat

Fact 1: Awindmill converts wind energy into electricity primarily by using mechanical energy. Fact 2: Today, new kinds of windmills, called wind turbines, generate electricity. Given the two facts above, what type of energy does a wind turbine use to convert wind energy?
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A:
mechanical