A. Choose the letter of the best answer. Write your answer in one whole sheet of paper. 1. What force do the brakes on a bicycle produce to stop the bike? a. pitch b. gravity c. friction d. magnetism 2. Which of the following statements best describes friction? a. It is the force that occurs between solids. c. It is a force that occurs only on rough surfaces. b. It is a force that occurs when surfaces touch d. It is a force that occurs between solids and liquids. each other. 3. What causes falling objects to fall? a. acceleration b. gravity C. speed d. wind 4. What happens when you go against gravity? a. It has accelerated motion c. It can possibly stop moving b. It has decelerated motion d. It can go up again 5. Why is a parachute important to a skydiver? a. It directs his motion c. It slows down his motion to have a safe landing. b. It makes him fall faster d. It keeps him appear beautiful as he falls down
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