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Chapter 10, Section 4 Action and Reaction

Chapter 10, Section 4 Action and Reaction. Wednesday, March 17, 2010 pages 332 -- 337. Objectives. State Newton’s third law of motion. Define and calculate momentum and state the law of conservation of momentum. Vocabulary Words. Momentum Law of Conservation of Momentum.

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Chapter 10, Section 4 Action and Reaction

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  1. Chapter 10, Section 4Action and Reaction Wednesday, March 17, 2010 pages 332 -- 337

  2. Objectives • State Newton’s third law of motion. • Define and calculate momentum and state the law of conservation of momentum.

  3. Vocabulary Words • Momentum • Law of Conservation of Momentum

  4. Newton’s Third Law of Motion • Newton’s 3rd Law of Motion states that for every action, there is an equal and opposite reaction.

  5. Do Action-Reaction Forces Cancel? • Action-Reaction forces cancel out ONLY if the forces are equal in strength but opposite in direction. • Newton’s 3rd law refers to forces on 2 different objects. • In the volleyball example, one force is on the ball and the other is on the player.

  6. Momentum • Momentum of an object is the product of its mass and its velocity. Momentum=Mass x Velocity • Unit of measurement is for mass is kg and the unit of measurement for velocity is m/s.

  7. Momentum -- cont’d • The more momentum an object has, the harder it is to stop. • A high velocity can also produce a large momentum even when the mass is small.

  8. Practice Problems • Read and solve the practice problems on page 335. • We will correct in 10 minutes.

  9. Conservation of Momentum • The law of conservation of momentum states that the total momentum of the objects that interact does not change. • The quantity of momentum is the same before and after they interact. • The total momentum of any group of objects remains the same unless outside forces act on the objects.

  10. Momentum of 2 Moving Objects • If 2 cars are traveling in the same direction and one car is going faster than the other, eventually the faster car will catch up with the slower car. • The two cars will contact. • The faster car will slow down and the momentum of the slower car will increase. • See Figure 9A on page 336.

  11. Momentum of 1 Moving Object • If a car is moving and hits a car that is not moving, the moving car will stop but the car that was not moving will begin to move. • The total momentum is the same except the momentum of the moving car is now transferred to the non-moving car. • See Figure 9B on page 337.

  12. Momentum of 2 Connected Objects • If a moving car hits a non-moving car but instead of bouncing off each other, the cars couple together (attach), momentum is still conserved. • After the collision, the velocity of the first car will now be halved with the remaining half shifted to the non-moving car. • See figure 9C on page 337.

  13. Homework • Workbook 10.4 (3/23) • Vocabulary quiz (3/23) • Worksheet 10.3 and 10.4 (3/19)

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