Friction Flashcards
(16 cards)
What is friction
Friction is the force between 2 touching objects.
How does friction affect things?
Slow down of make it still.
Why is friction important?
So we can walk easily without slipping off.
So we can sit on chairs without slipping off.
What material increases friction?
Rubber
Why are the tyres of a f1 car made of rubber?
Stops the car from sliding off a sharp bend.
When is friction not useful?
When we want things to move easily
How can we reduce friction?
Using lubricants.
Making surfaces smoother.
Adding a lubricant is called
Lubrication
Name an example where friction is not useful.
Bicycle are not easy to ride if there is friction in the axles.
Name some things that friction can wear away.
Brake pads on a bicycle.
Car tyres.
Part of clothes get thinner
What can friction produce?
Heat and noise
Name an example of heat caused by friction
If an engine runs without oil the friction between the moving parts causes heat.
Name an example of noise caused by friction
Rusty door hinges squeak make a door hard to open.
What are 2 types of friction
Air resistance
Water resistance
True or false questions: (with corrections)
1- Friction is a force between 5 touching objects.
2-We can increase friction using rubber.
3-friction makes thing still or slow down.
4-Friction is always useful.
5- adding a lubricant is called air resistance.
6-Friction wears things away.
7-friction only produces heat.
8-air resistance and water resistance are both kinds of friction.
9-gases and liquids can also cause friction.
False (2 touching objects)
True
True
False (not always)
False (lubrication)
True
False (heat and noise)
True
True
