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Force
Is simply defined as push and pull.
Contact force
These force that need to be in direct contact with the object to apply force in it.
Types of Contact force
•Frictional force
•Applied force
•Normal force
Friction
Is a force exerted by a surface as an object move across it
Applied
Is a force directed to an object by a person or another object
Normal force
Is the support force exerted by a surface that is in contact with another object
Non-contact force
Are forces that do not need to be in direct contact with an object in order to be applied.
Types of Non-contact force
•Gravitational force
•Electromagnetic force
•Nuclear force
Gravitational force
Is a force that pulls object towards the center of the earth
Gravitational force
Keeps people on the ground.
Electromagnetic force
Is a force that combines electric and magnetic
Nuclear force
Is a force that holds the protons and neutrons within the nucleus
Note 
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