Lec 05: Newton’s Third Law

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Presentation transcript:

Lec 05: Newton’s Third Law Applications of Newton’s Law

How Hard Does the Wall Push? Interaction between 2 objects Person pushes Wall Each object experiences it The direction is opposite for each object Wall pushes Person Both experience same strength of push

Newton’s Third Law As two objects interact, each experiences a force equal in strength but opposite in direction Person pushes Wall Wall pushes Person

Being with the Force As Earth pulls you towards its center with a force of 500 N, Do YOU exert a force on Earth? Yes, but very small Yes, exactly 500 N No, you are too small I don’t know

Bus-Bug Collision A high-speed bus colliding head-on with a flying bug. Which is greater, the force on the bug or the force on the bus? Bus Bug Both are the same I don’t know

Bus-Bug Collision A high-speed bus colliding head-on with a flying bug. Why does not the bus “feel” it? F m = a Newton’s Second Law Which one has a bigger acceleration? Bus Bug Both are the same I don’t know

Puzzles P1. You trip over and fall into a pool. Not knowing how to swim, you begin to sink. You grab yourself by the hair and pull upward, but it doesn’t seem to work. Which of the Newton’s Laws can explain why it doesn’t work. P2. Two people of equal mass on slippery ice push off from each other. Will both move at the same speed? (a) Yes (b) Yes, but only if both push equally (c) No P3. A bird flies off upward toward the sky. What force is responsible for the upward motion? P4. You get angry at your friend and punch him in the face. Why does YOUR hand hurts, if you were the one punching?

Newton’s Three Laws A Net Force is required to change the velocity (motion) of an object The net force is proportional to the acceleration (F = ma) Acceleration Net Force = Mass Two interacting objects experience opposite but equal in strength forces (action and reaction)