apple, earth. earth more massive than moon. astronauts showed this - armstrong etc
Answer:
when a force is applied by one object to a second object, an equal and opposite force is applied back on the first object
Explanation:
Newton's 3 laws are...
inertia: things tend to continue to do what they are doing.
Change: to make something change you need a force to change it. the force needed = the mass times its acceleration
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Resistance: When you push on something, it pushes back.
From yahoo answers
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