Nebraska NSCAS Science Grade 8 Practice Questions - Nebraska Student-Centered Assessment System Science - Grade 8 Exam

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A skydiver falls from an airplane. After falling for several seconds, she stops speeding up and continues downward at a constant terminal velocity. Which statement best explains why her speed becomes constant?

Air resistance increases with speed until it balances the force of gravity on her. Gravity becomes weaker as she gets closer to the ground. Her mass decreases as she falls, reducing the gravitational force. There is no air resistance acting on her once she reaches terminal velocity.

Correct Answer:

Air resistance increases with speed until it balances the force of gravity on her.

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