Activity 3: Multiple Choice Read each item carefully. Circle the letter of the correct answer. 1. What makes a rolling ball slow down and stop? a. air resistance b. brake c. friction d. gravity 2. Which of the following is true? 1. Friction slows down a moving object. II. Smooth surface has more friction. III. Objects move slowly in a rough surface. IV. Friction is not present in a smooth surface. 1, 11 b. II,III 3. How is brake useful? d.III, IV a. It uses friction to move the vehicle easily. b. It uses friction to make vehicles move faster. c. it uses friction to slow down a moving vehicle. d. it uses friction to move the vehicle to any direction. 4. Why are oil and lubricants applied to a machine's parts. 1. To make the parts move easily. II. To prevent the parts from moving fast. III. To protect the parts from wearing down. IV. To make the parts move slowly. a. I. II b. I,III c. ||, III 5. Which shows that more friction is useful? a. Wheels of cars have jagged surface. b. Bowling lane is smooth. d. III, IV d. Slides have smooth surface. c. Heavy appliances have rollers.​