1) Which of the following statements best describes friction? a) It is a force that occurs in two solids. b) It is a force that occurs only on rough surfaces. c) It is a force that occurs between solids and liquids. d) It is a force that occurs when surfaces touch each other. 2) Which can cause the greatest friction? a) polished floor b) rough floor c) tiled floor d) wet floor 3) How can you best reduce friction between the bottom or feet of furniture and the floor? a) by making the floor smooth b) by keeping furniture on their place c) by applying lubricants like wax on the floor d) by putting wheels or rollers on the bottom or feet of furniture 4) When is friction undesirable? a) pushing furniture b) lighting a matchstick c) walking on the street d) using the breaks when approaching a stoplight 5) Which surface will produce the least amount of friction? a) fuzzy soccer field b) grassy soccer field c) gravel running track d) smooth glass tabletop 6) Why is it easy to slip when there is water on a smooth floor? a) The water increases the friction between your feet and the floor. b) The water is a lubricant and reduces the friction between your feet and the floor. c) The friction between your feet and the floor changes from kinetic to static friction. d) The friction between your feet and the floor changes from sliding kinetic friction to rolling kinetic friction. 7) Which type of friction is used when an object moves through a liquid or gas? a) dry b) fluid c) sliding d) static 8) Which of the following situations show that friction is helpful? a) brakes used on a bike b) tires from a car on the road c) tread on the bottom of your shoes d) all of the above 9) How can friction be reduced? a) use wax, grease or oil b) reduce the force acting between the 2 surfaces c) reduce the roughness of the 2 surfaces coming in contact d) All of the above are ways of reducing friction 10) Which is NOT a way of reducing friction? a) making rough surfaces b) making the surfaces smoother c) using lubricants such as waxes, oils, or grease d) changing from sliding friction to rolling friction using ball bearings

FRICTION: ASSESSMENT

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