Answer:
a.contact forces
A non-contact force is a force which acts on an object without coming physically in contact with it.
b.non contact forces
A contact force is a force which acts on an object coming physically in contact with it.
a.balance forces
When two forces acting on an object are equal in size but act in opposite directions, we say that they are balanced forces.
b.unbalance forces
When two forces acting on an object are not equal in size, we say that they are unbalanced forces.
Explanation:
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