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a proper factor is a factor.
no certainly not, the collision is effective is the collision occur with adequate energy and at proper angle ( also known as collision theory).
No. Prime numbers don't have proper factors.
It can be. 18 is a proper factor of 36.
It can be. 42 is a proper factor of 84.
It can be. 24 is a proper factor of 48.
It can be. 25 is a proper factor of 50.
It depends on the number being factored. 22 is a proper factor of 44. 22 is a factor, but not a proper factor, of 22.
It can be. 22 is a proper factor of 44.
It can be. For example, 36 is a proper factor of 72 and of 108.
It can be. 11 is a proper factor of 22, among others.
Proper is an adjective, factor is a noun.