Matter in Motion - Friction:A Force that Opposes Motion
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What example results in a helpful increase of friction? | sand applied to a slick sidewalk
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| What example results in a helpful decrease of friction? | oil added to a car engine
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| What is a force that opposes motion between two surfaces that are in contact? | friction
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| Name two factors that determine the amount of friction. | the force and the roughness of the surface
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| What is an example of an object opposed by kinetic friction? | a box sliding on a floor
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| What is an example of an object opposed by static friction? | a worker pushing on a non-moving box
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| Name an activity where friction is helpful. | car tires moving a car forward
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| Name an activity where friction is harmful. | car engine parts wearing out
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| What is a way NOT to reduce friction? | pouring sand on ice
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| When a mover puts furniture on a dolly with wheels, which type of friction is the mover using to make his job easier? | rolling kinetic friction
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| Why does friction occur? | the roughness of any object's surface
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| What is a way to reduce friction? | wax skis before skiing down a slope
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| What is friction? | a force that always acts to oppose motion
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| When is friction greater? | when surfaces have more roughness
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| What happens when force is applied to two surfaces in contact? | when force is applied, friction increases
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| When a teacher tries pushing a large desk slowly across the classroom floor, but the large desk will not move, what is keeping the desk from moving? | static friction
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| When two students help the teacher push a large desk slowly across the classroom floor, what resistance opposes the faster movement of the desk? | sliding kinetic friction
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| When the teacher and students get a dolly to move a large desk, what force of resistance opposes the motion of the desk? | rolling kinetic friction
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| Name three common items you might use to increase friction. | sand, work gloves, and sticky tape
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Created by:
masonteach
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