Given a scientific passage and an answer, generate a question for the given answer.

Q: Passage: The energy in sunlight, or solar energy, can be used to heat homes. It can also be used to produce electricity in solar cells. However, solar energy may not be practical in areas that are often cloudy. Answer: solar energy

A: The energy in sunlight is also known as what kind of energy?
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Q: Passage: Acidity is measured on a pH scale. Rain that is 5.0 or less on that scale is considered acid rain. Answer: ph scale

A: Acidity is measured on what kind of scale?
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Q: Passage: With the help of muscles, joints allow the body to move with relatively little force. Answer: joints

A:
Along with muscles, what helps the body move with relatively little force?
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