Question

Which of the following is an example of increasing friction?
A. scrubbing the floor
B. Applying oil on door hinges
C. Putting grease on machines
D. Spreading gravel on the road

Answer 1

Answer:

waxing skis -adding grease to gears on a bike -throwing sand on an icy driveway -oiling a squeaky door.B applying oil on door hinges.

Answer 2

Answer:

B. Applying oil on door hinges

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