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Interaction
A relationship between two objects involving forces.
Force Pair
Two forces acting on different objects mutually.
Newton's Third Law
For every action, there is an equal reaction.
Action Force
The force exerted by the first object.
Reaction Force
The force exerted by the second object.
Equal and Opposite Forces
Forces that are equal in strength, opposite in direction.
Different Objects
Action and reaction forces act on separate entities.
Example of Interaction
Hand and wall pushing against each other.
Rocket Interaction
Rocket pushes gas; gas pushes rocket back.
Car Tires and Road
Tires push back; road pushes tires forward.
Mass Influence
Greater mass results in less perceptible motion.
Earth's Gravitational Pull
Earth pulls objects downward due to gravity.
Perceptible Motion
Motion too small to be noticed by humans.
Force of Kicking
Player kicks ball with 1500 N of force.
Reaction to Kicking
Ball exerts 1500 N force back on player.
Step Off Curb
You pull Earth upward while falling.
Earth's Mass
Earth's enormous mass makes its motion imperceptible.
Action-Reaction Pair
Identifying forces in an interaction context.
Force Existence
Neither action nor reaction force exists alone.
Interaction Identification
Recognizing forces acting between two objects.
Air Resistance
Opposing force encountered when moving through air.
