This is a Clilstore unit. You can .
What is a force?
It's push or pull.
What can a force do?
What is the unit of force?
The unit of force is Newton.
What are the types of forces?
Contact and non-contact forces
What are contact forces?
Those are forces that need touch for example opening a door.
What are non-contact forces?
Those are forces that do not need contact for example magnets.
Give a force.
What is friction?
It is a force between two surfaces.
How does friction depend on the surface?
The rougher the surface the higher the friction.
What is the direction of friction force?
It is opposite to the motion.
What does friction do?
It prevents an object from moving or even stop it.
Give some uses of friction?
For example friction is important to walk.
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