1. push and A force C. pressure pull on an object is called B. motion 2. What increases friction? A more speed C. smooth surfaces D. push-pull Brough surfaces D. more surface arra 3. The following can reduce friction EXCEPT Csand A grease Bod D. water . A ball on the ground slows down and finally stops. This is because A Iriction C. BUDION D. Je socce applied 5. The rubbing of one object or surface against another is A electrical force B. frictional force force C. magnetic force D. gravitational 6. What is a force that works against motion? C gravity D. motion A energy B. friction 7. Which has the greatest friction? A polished floor B. sandy floor C tiled floor D. wet floor 8. Which surface creates more friction? A magnetic surface B slippery surface C rough surface D. shiny surface 9 Which has the least amount of friction? A. carpet B. concrete Cice of D. gruss 10. A parachute helps a parachutist land safely on the ground or water by A reducing air resistance that speeds up its motion B. reduces air resistance that slows down its motion C. increasing air resistance that speeds up its motion D. increasing air resistance that slows down its motion 11. What is a force that opposes motion between two surfaces sticking or touching together? A friction B. static friction C. rolling friction D. aliling tion 12 What is static friction? A It is produced when an object rolls over a surface. B. It is caused by chemical bonding between surfaces.surface. D. It is a friction between moving objects

object moving in the air.

It is a kind of friction that prevents an object from moving against a and a liquid ar between an

13. What is a friction that occurs in stationary objects?

A. fluid friction B. static friction

C. rolling friction D. sliding friction

14. Is friction important to cars? Why?

A. No, because friction has no effect on cars

B. No because friction cannot slow down cars.

C. Yes because friction causes the cars to stop

D. Yes because friction causes the cars to move

15. Why do tires have hollows and bumps?

A. to move fast

B. to slide on the surfaces

C. to drag over the surfaces D. to hold on to different surfaces

16. Which of the following words implies no motion? A. force B. friction C. gravity D. static

17. Which of the following statements is TRUE? A. Static friction results when moving objects or rough surfaces rub

together. B. Static friction occurs in a swimmer swimming in water or a boat travelling in water.

C. Static friction occurs between two objects that are in motion against

each other. D. Static friction occurs when two objects rub against each other or slide

against each other.

18, Justine places the pile of books on the table. What friction is being

shown?

A. fluid friction B. static friction

C. rolling friction D. sliding friction

19. Which of the following is an example of static friction?

A. Rubbing both hands with each other B. Feet against the ground when walking

20. Why does static friction exist?

C. The wheels of a bicycle against the ground D. A heavy box against the ground that difficult to lift and move

A. Because surfaces are smoother when you move an object

B. Because surfaces are smoother before you move an object C. Because surfaces have imperfections and adhesion occurs between

the two stationary surfaces D. Because surfaces have imperfections, but adhesion does not occur

between the two stationary surfaces​