Forces and Interactions - Action / Reaction:
1. Define force as part of an interaction..
2. State Newton's third law of motion..
3. Given an action force, identify the reaction force.
interaction action force Newton's third law reaction force
Newton's Third Law:
"Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object."
Forces come in pairs. For every action there is an equal and opposite reaction. All the forces of everyday life can either be labeled as an action force or a reaction force. Follow these simple rules:
A common misconception when dealing with the action / reaction pairs is that all the forces will cancel each other out because all the forces appear to be balanced. The trick is to look ONLY at the forces that apply to a single object as a system to determine if movement is taking place.
To solve for the orange, you must only look at the system of forces affecting the orange (blue).
Label the action /reaction forces below.
(Jet Propulsion Laboratory Website)