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Understanding Newton's Third Law of Motion

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tybalt
14 diapositives · 250 Views · Oct 13, 2014

Take notes on Newton's Third Law of Motion regarding action and reaction forces. Discuss force pairs with examples and challenging motion detection scenarios. Enhance understanding through interactive learning activities.

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Understanding Newton's Third Law of Motion
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  1. Per 1 5 6 and 7Take notes on the following in your Physics Journals 11.13.2013 HW will be handed out, due on FRIDAY Quiz on Forces on Friday 11.15 TEST on Forces is THURSDAY 11.21

  2. Newton’s Third Law of Motion Copy into your journals!

  3. For every action force there is an equal and opposite reaction force. Copy into your journals! Force of air pushing on balloon Force of balloon pushing on air

  4. Action: force of gases pushing on rocket Copy into your journals! Reaction: force of rocket pushing on gases

  5. For every action force that can be identified there is a matching reaction force on a different object. Discuss the force pairs with a neighbor! • Paddle pushes on water, water back on paddle, person on kayak, kayak on person. Water on kayak, kayak on water. • Rider on horse, horse on rider.

  6. Action – Reaction force pairs do not “balance” because there are acting on two different objects. Copy into your journals!

  7. Detecting motion when paired forces are in action can be challenging because you will only see the less massive object move. What if everyone in the world jumped at once? Draw this picture!

  8. Check your understanding. • A man is pulling a wagon. Identify the objects and the interactions between them. Man applies a force on the wagon; wagon applies a reaction force on the man’s arm.

  9. Check your understanding. • A roller skate glides at a constant speed on a frictionless surface. Identify the objects and the interactions between them. • Surface exerts normal force on object; object’s weight is on surface. • Earth exerts gravitational force on object; object exerts gravitational force on earth.

  10. Check your understanding. • A piano is pulled upward at a constant speed, by a person pulling downward, on a rope and pulley. Identify the objects and the interactions between them. • Rope tension pulls on piano; rope tension pulls on person.

  11. Check your understanding. • A car slows down. Identify the objects and the interactions between them. • Road exerts frictional force on car; car exerts frictional force on road. • Surface exerts normal force on car; car’s weight is on surface. • Earth exerts gravitational force on car; car exerts gravitational force on earth.

  12. Check your understanding. • A kitty lies motionless on the floor. Identify the objects and the interactions between them. • Surface exerts normal force on object; object’s weight is on surface. • Earth exerts gravitational force on cat; cat exerts gravitational force on earth.

  13. Check your understanding. • A fan hangs on a rod attached to the ceiling. Identify the objects and the interactions between them. • Rod pulls on fan; fan pulls on rod.

  14. Check your understanding. • An apple is falling from a tree without air resistance opposing its motion. Identify the objects and the interactions between them. • Earth exerts gravitational force on apple; apple exerts gravitational force on earth.