5.3 physics

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.