1. If you push or pull a box of books on the floor, the surfaces of the box and the floor slide against one another. What is a force that opposes motion between two surfaces sticking or touching together? A. density B. friction C. gravitational pull D. gravity 2. Static friction is also shown in a book, or any object placed on a table or any surface which remains still. What is static friction? It is A. produced when an object rolls over a surface. B. caused by chemical bonding between surfaces. C a kind of friction that prevents an object from moving against a surface. D. a friction between moving objects and a liquid or between an object moving in the air. 3. Even in objects at rest, there's friction acting on it. What kind of friction is it? A, fluid B. rolling C.sliding D. static 4. Kinetic friction occurs between moving objects. Which of the following exhibits kinetic friction? A. book on the table C. ball rolling on the floor B. chair folded on the floor D. man leaning on the wall 5. You've noticed mangoes falling from your backyard. What do you think is the simplest reason behind it? A, acceleration B. gravity C. mass D. wind 6. You're playing soccer with your friends. You've realized that the ball slow down and stops once in a while. Why do you think it happen? It is because of A. air resistance B. brake C. friction D. gravity 7. The boat sailing on the sea slows down. What kind of friction is acting on it? A fluid B. rolling csliding D. static 8. Your father keeps on reminding you about the importance of using the brakes of the car. How is brake useful? It uses friction to A move the vehicle easily. B. make vehicles move faster.​