# 5.3 physics

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1.
1 point
___________ is a force that resists the motion of objects or surfaces.
2.
1 point
________ _________ is present when two objects or surfaces slide across each other.
3.
1 point
Contact between the surfaces can cause the tiny bumps to ______ shape or wear away.
4.
1 point
Friction depends on both of the __________ in contact.
5.
1 point
Friction is a force, measured in __________ just like any other force.
6.
1 point
If you push the box to the left, the force of the sliding friction acts to the ____________.
7.
1 point
_______ friction acts to keep an object at rest from starting to move.
8.
1 point
The box stays at rest, therefore the net force is ________.
9.
1 point
The _________ of static friction is equal and opposite your applied force up to a limit.
10.
1 point
___________ friction is a force that resists the motion of an object already moving.
11.
1 point
Pushing a box across the floor at constant speed is actually another example of __________.
12.
1 point
The reason is that ___________ friction is greater than sliding friction for almost all combinations of surfaces.
13.
1 point
The amount of __________ that exists when a box is pushed across a smooth floor is greatly different from when it is pushed across a carpeted floor.
14.
1 point
To pull the paper at a constant speed, the ________ you apply must be equal in strength to the sliding friction.
15.
1 point
The greater the _______ squeezing two surfaces together, the greater the friction force.
16.
1 point
If the weight doubles, the _______ of friction also doubles.
17.
1 point
Any motion where surfaces move across each other or through _____ or water always creates some friction.
18.
1 point
The fluid used to reduce friction is called a ____________.
19.
1 point
In systems where there are rotating objects, ______ ________ are used to reduce friction.
20.
1 point
Well-oiled bearings rotate easily and greatly _______ friction.
21.
1 point
Another method of reducing friction is to separate the two surfaces with a cushion of ________.
22.
1 point
Friction between the brake pads and the rim slows the _________.
23.
1 point
________ is the force that keeps nails in place.