Forces can act from a distance o through contact. When they act from a distance they are cold non-contact forces. When they come into contact with the object they are called contact forces.
NON-CONTACT FORCES
Magnetism is a force that can attract or repel mangetic objetcs. Let's watch the following video.
Gravity is a non-contact force that pulls objects towards each other.
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CONTACT FORCES
We have got two different contact forces: Applied force and Buoyant force.
When an object is put in a liquid there is an upward force acting on it called buoyancy. This is what makes objects float.
Watch the following videos about this force:
