Friction
Terms
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- 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.