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QOD QOD QOD QOD. If you went to space, what would change? Your weight? Or your mass?. Newton’s Third Law Review. Push or Pull. A force is a push or a pull upon an object which results from its interaction with another object. Ex:

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QOD QOD QOD QOD

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  1. QOD QOD QOD QOD

  2. If you went to space, what would change? Your weight? Or your mass?

  3. Newton’s Third Law Review

  4. Push or Pull • A force is a push or a pull upon an object which results from its interaction with another object. • Ex: • When you sit in your chair, your body exerts a downward force on the chair and the chair exerts an upward force on your body.

  5. Action - Reaction • There are two forces resulting from this interaction — a force on the chair and a force on your body. • These two forces are called action and reaction forces and are the subject of Newton's third law of motion.

  6. Newton's third law is: • "For every action, there is an equal and opposite reaction.“ The statement means that in every interaction, there is a pair of forces acting on the two interacting objects.

  7. Forces always come in pairs – equal and opposite action-reaction force pairs.

  8. What are the two forces in: A fish swimming

  9. Consider the propulsion of a fish through the water. A fish uses its fins to push water backwards. But a push on the water will only serve to accelerate the water. • In turn, the water reacts by pushing the fish forwards, propelling the fish through the water.

  10. What are the two forces in:The flight of a bird.

  11. Consider the flying motion of birds. A bird flies by use of its wings. The wings of a bird push air downwards. In turn, the air reacts by pushing the bird upwards. The size of the force on the air equals the size of the force on the bird; the direction of the force on the air (downwards) is opposite to the direction of the force on the bird (upwards).

  12. What are the two forces in:Driving a car (wheels on the ground)?

  13. Consider the motion of your automobile on your way to school. An automobile is equipped with wheels that spin backwards. As the wheels spin backwards, they push the road backwards. In turn, the road reacts by pushing the wheels forward.

  14. Questions • 1. While driving, Anna Litical observed a bug striking the windshield of her car. Obviously, a case of Newton's third law of motion. The bug hit the windshield and the windshield hit the bug. Which of the two forces is greater: the force on the bug or the force on the windshield?

  15. The baseball forces the bat to the right (an action); the bat forces the ball to the left (the reaction). • Note that the nouns in the sentence describing the action force switch places when describing the reaction force.

  16. Action-Reaction Pairs • According to Newton's third law, for every action force there is an equal (in size) and opposite (in direction) reaction force. Forces always come in pairs — known as "action-reaction force pairs."

  17. The action force is stated; determine the reaction force. Use the pop-up menu to view the answer. • Athlete pushes bar upwards.

  18. Bowling ball pushes pin rightwards. • A. The pin pushes the bowling ball leftwards

  19. 2. Rockets are unable to accelerate in space because ... • there is no air in space for the rockets to push off of. • there is no gravity is in space. • there is no air resistance in space. • ... nonsense! Rockets do accelerate in space. How?

  20. Jet pack!

  21. Identify at least five pairs of action-reaction forces in the following diagram.

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