# Physics

posted by Max

A bike is hanging from a hook in a garage. You need to consider the following forces.
(a) The force of the Earth pulling down on the bike.
(b) The force of the bike pulling up on the Earth.
(c) The force of the hook pulling up on the bike.
(d) The force of the hook pulling down on the ceiling.
Which two forces are equal and opposite because of Newton's third law?
Which two forces are equal and opposite because of Newton's first law?
I would like to say A and B for the first question and A and C for the second one but I'm not sure

1. Damon

Yes a and b for the first one, the force the bike exerts on earth is the same magnitude as the force earth exerts on the bike.
Yes c and d for the second one. The net force on the hook is zero so its momentum does not change.

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