Conceptual Physics 11 th Edition. Chapter 5: NEWTON’S THIRD LAW OF MOTION. Forces and Interactions Newton’s Third Law of Motion Vectors. Forces and Interactions. Interaction is between one thing and another. requires a pair of forces acting on two objects.
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Conceptual Physics11th Edition
NEWTON’S THIRD LAW OF MOTION
Forces and Interactions
Newton’s Third Law of Motion
Example: interaction of hand and wall pushing on each other
Force pair—you push on wall; wall pushes on you.
Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
Action and reaction forces
Example: Tires of car push back against the road while the road pushes the tires forward.
Simple rule to identify action and reaction
Example: Action—rocket (object A) exerts force on gas (object B).
Reaction—gas (object B) exerts force on rocket (object A).
Action and Reaction on Different Masses
Defining Your System
Example: velocity, force, acceleration
Example: mass, volume, speed
The sum of two or more vectors
Nellie Newton hangs from a rope as shown.