North Dakota A+ Science Grade 4 Practice Questions - North Dakota A+ Summative Science - Grade 4 Exam

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A student pushes a swing. After the student lets go, the swing moves back and forth, going a little less high each time. Why does the swing eventually come to a stop?

Friction and air resistance transfer the swing's energy to other forms. The swing runs out of force and has to be pushed again. Gravity pulls the swing down only when it is moving. The swing stops because no energy was ever given to it.

Correct Answer:

Friction and air resistance transfer the swing's energy to other forms.

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