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8. What force must be acted upon an object in order for it to produce motion?
A. balanced
B. friction
C. non-contact
D. unbalanced
19​


Sagot :

Answer:

b . friction

Explanation:

Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.