Law of Interaction - it is the newtons third law of motion

Law of Interaction - Action Reaction Law

1. ACTION-REACTION Third Law of Motion: NEWTON’S

2. Interactions Produce Forces FORCE is a push or pull. The forces exerted by two objects on each other are often called an action-reaction force pair.

3. “ For every action, there is an equal and opposite reaction ”

4. Whenever one object exerts a force on a second object, the second object exerts an equal but opposite force on the first object.

5. One force is called the action force and the other force is called the reaction force. Neither force can exist without the other.

6. Identifying Action & Reaction Object A exerts a force on Object B then in reverse Object B exerts a force on object A

7. The reaction force is the upward push on the rocket engine by the gas molecules. This downward push is the action force. Identifying Action & Reaction

8. Action : tire pushes on road Reaction: road pushes on tire

9. Identifying Action & Reaction

10. Identifying Action & Reaction Action: Tyre pushes road Reaction: Road pushes tyre

11. Identifying Action & Reaction

12. Identifying Action & Reaction Action: Rocket pushes gas Reaction: Gas pushes rocket

13. Action and Reaction on Different Masses A bug with a mass of 5 grams flies into the windshield of a moving 1000kg bus. Which will have the most force? The bug on the bus The bus on the bug

14. Action and Reaction on Different Masses Consider a cannon and cannon ball. According to Newton’s second law we must consider the masses. Cannon ball: F / m = a Cannon: F/ m = a

15. Think! The astronauts working on the space station have a serious problem when they need to move around in space: There is nothing to push on. One solution is to throw something opposite the direction you want to move

16. Why Don't Action & Reaction Forces Cancel? "If A pushes B , then B pushes A with an equal and opposite force. If these forces are equal and opposite, they cancel, producing a net force of zero. This means that neither object can accelerate, which means that Newton's Laws predict that nothing can ever move."

17. These forces DO NOT CANCEL because they influence the motion of different objects . The force that A exerts on B influences B 's motion, and the force that B exerts on A influences A 's motion. The force on B can cancel with other forces on B - but NOT with forces on A (and vice versa).

18. REFERENCES: Amrita.olabs.co.in,. (2012). Newton's Third law of Motion. Retrieved from December 2015, from amrita.olabs.co.in/?sub=1&brch=1&sim=105&cnt=1 http://physics.stackexchange.com/questions/103814/action-and-reaction-pair-problem Newton's Third Law of Motion (2010). Retrieved from http://www.4physics.com/phy_demo/newton/newton_3.htm https://www.grc.nasa.gov/www/k-12/WindTunnel/Activities/third_law_motion.html