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Which of the following is a contact force?
A.Air resistance
B.Magnetic force
C.Gravity
D.Electrical force

Respuesta :

RickyChen
The contact force is indeed caused by "Contact". 

Air resistance is basically a type of friction, which is apparently present providing two object contact.

The rest selections are all interaction force, which is not necessarily caused by contact.
Nehem
Air resistance is a contact force as the air comes in direct contact with the object and pushes against it. Magnetic force - you can attract a magnet without touching it. Gravity, works on you when you are not in contact with the earth, pulling you down. Electrical force, between 2 electrons when not in contact.

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