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Newton's Third Law of Motion: Action
and Reaction
Forces in a Scenario: Rock and Earth
When a rock is thrown upwards, the Earth experiences an
opposite and equal force (also known as the actionreaction pair)
Newton's Third Law of Motion
States that for every action, there is an equal and opposite
reaction
Mathematically: F(action) = -F(reaction)
Gravity and Normal Forces
Gravity is the force that pulls objects towards the Earth
Normal force is the force that the Earth exerts on an object
to counteract the force of gravity
These two forces create an action-reaction pair
Note:
Action and reaction forces are always equal and opposite
to each other
These forces act on different bodies and not on the same
body
Both forces exist simultaneously and act along the same
line
...
The force exerted by object A on object B is equal in
magnitude and opposite in direction to the force exerted
by object B on object A
...
The normal force is the force that acts perpendicular to the
surface of contact between two objects
...
In the scenario of a rock on earth, the normal force is equal
in magnitude to the force of gravity