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In which of the following activities is friciton harmful?
False
car tires moving a car forward
True
car engine parts wearing out
a box sliding on a floor
pouring sand on ice
the force and the roughness of the surfaces
a worker pushing a non-moving box
In which of the following activites is friction helpful?
False
car tires moving a car forward
True
car engine parts wearing out
a box sliding on a floor
pouring sand on ice
the force and the roughness of the surfaces
a worker pushing a non-moving box
Which would NOT be a way to reduce friction?
False
car tires moving a car forward
True
car engine parts wearing out
a box sliding on a floor
pouring sand on ice
the force and the roughness of the surfaces
a worker pushing a non-moving box
Does the use of sandpaper on a piece of wood demostrate fricton?
False
car tires moving a car forward
True
car engine parts wearing out
a box sliding on a floor
pouring sand on ice
the force and the roughness of the surfaces
a worker pushing a non-moving box
Which of these is opposed by statce friction?
False
car tires moving a car forward
True
car engine parts wearing out
a box sliding on a floor
pouring sand on ice
the force and the roughness of the surfaces
a worker pushing a non-moving box
Is all matter effected by gravity?
False
car tires moving a car forward
True
car engine parts wearing out
a box sliding on a floor
pouring sand on ice
the force and the roughness of the surfaces
a worker pushing a non-moving box
Which are the two factors that determine that amound of friction?
False
car tires moving a car forward
True
car engine parts wearing out
a box sliding on a floor
pouring sand on ice
the force and the roughness of the surfaces
a worker pushing a non-moving box
Which of these is opposed by kinetic friction?
False
car tires moving a car forward
True
car engine parts wearing out
a box sliding on a floor
pouring sand on ice
the force and the roughness of the surfaces
a worker pushing a non-moving box
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