14 When is friction indesitable
A pushing futtate
B fighting & matchstick
C walking on the street
A fuzzy soccer field
B grassy soccer field
D using the breaks when approaching a stoplight
15 Which surface will produce the least amount of friction
C graeil running track
Dsmooth glass tabletop
16. Why is it easy to slip when there is water on a smooth floor
A The water increases the friction beteveen soon feet and the floor
C The friction between your feet and the floor changes from kinetic to static friction
B The water is a lubricant and reduces the friction between your feet and the floor
D The friction between your feet and the floor changes from Sliding kmetic fruction to
17 Which type of friction is used when an object moves through a liquid or gas?
C sliding
D static
rolling kinetic friction
A. dry
B. fluid
18. Which of the following situations show that friction is helpful?
brakes used on
B tires from a car on the road
C tread on the bottom of your shoes
D all of the above
19. How can friction be reduced?
A use was, 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
20. 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​