Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
21 Cards in this Set
- Front
- Back
|
What are the 4 types of friction?
|
... sliding friction, rolling friction, static, and fluid friction.
|
|
|
What property of a surface or material describes its roughness or smoothness and affects the size of frictional force?
|
... texture.
|
|
|
What is friction?
|
a force that opposes the direction of motion of an object.
|
|
|
What is the weakest type of friction?
|
... fluid friction.
|
|
|
Lubricants reduce wear and tear on machinery by converting sliding friction in __________ friction.
|
... fluid
|
|
|
For friction to occur, two surfaces must be in ...
|
... contact.
|
|
|
What explains why a 2 kg block of wood with dimensions of 6cm x 12cm has more friction acting against it when slid along a table than another block with dimensions of 4cm x 6cm made of the same material and with equal mass?
|
... surface area.
|
|
|
What fluid frictional force opposes the motion of a falling object, sometimes causing it to fall more slowly than it otherwise would?
|
... air resistance.
|
|
|
Why is starting friction greater than sliding friction?
|
... because it must overcome the inertia of an object to put it in motion.
|
|
|
What is the strongest type of friction?
|
... sliding friction.
|
|
|
When does fluid friction occur?
|
... when an object moves through a liquid or a gas.
|
|
|
Friction is a _________ that opposes the direction of motion of an object.
|
... force
|
|
|
What property of an object related to its weight affects the size of friction?
|
... mass.
|
|
|
What produces rolling friction?
|
... wheels or ballbearings.
|
|
|
This property of an object to resist a change in its motion explains why starting friction is greater than sliding friction...
|
...inertia.
|
|
|
What can be applied to an object in motion to bring two surfaces in better contact that will also increase the amount of frictional force that is present?
|
... pressure.
|
|
|
Which is greater, starting friction or sliding friction?
|
... starting friction.
|
|
|
When does sliding friction occur?
|
... when two solids rub against eachother or slide over one another.
|
|
|
Lubricants reduce wear and tear on machinery by converting sliding friction into __________ friction.
|
... fluid
|
|
|
Friction always act in a direction that is ____________ to the direction of motion of an object.
|
... opposite
|
|
|
Why are lubricants such as oil used for moving machine parts?
|
... to reduce the amount of friction.
|
