# Friction: A Force That Opposes Motion: Question Preview (ID: 18616)

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In which of the following activities is friciton harmful?
a) an eraser erasing
b) car engine parts wearing out
c) brakes stoppping a car
d) a person walking

What is a force that opposes motion between two surfaces that are in contact?
a) motion
b) velocity
c) acceleration
d) friction

Which of these is opposed by statce friction?
a) a worker pushing a non-moving box
b) a pencil rolling on a table
c) a dog running in a yard
d) a chair sliding on a floor

Which would NOT be a way to reduce friction?
a) using ball bearings
b) using sandpaper
c) pouring sand on ice
d) lubricating with oil

Which are the two factors that determine that amound of friction?
a) hills and valleys and the roughness of the surfaces
b) the force and how much surfaces come in contact
c) the force and the weight exerted on the surfaces
d) the force and the roughness of the surfaces

Which of these is opposed by kinetic friction?
a) a box sliding on a floor
b) a child leaning on a building
c) a book sitting on a table
d) a cat standing in a yard

In which of the following activites is friction helpful?
a) soil erosion
b) engine parts wearing out
c) car tires moving a car forward
d) holes developing in your socks

Does the use of sandpaper on a piece of wood demostrate fricton?
a) False
b) True
c)
d)

Is all matter effected by gravity?
a) True
b) False
c)
d)

There are two Newton laws of motion
a) True
b) False
c)
d)

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