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Newton’s 3 rd Law of Motion: Momentum

Newton’s 3 rd Law of Motion: Momentum. Section 3: The Third Law of Motion. Objectives: State Newton’s third law of motion. Identify action and reaction forces. Calculate momentum. Recognize when momentum is conserved. Third Law of Motion.

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Newton’s 3 rd Law of Motion: Momentum

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  1. Newton’s 3rd Law of Motion:Momentum

  2. Section 3: The Third Law of Motion Objectives: • State Newton’s third law of motion. • Identify action and reaction forces. • Calculate momentum. • Recognize when momentum is conserved.

  3. Third Law of Motion • The third law states that for every action (force) in nature, there is an equal and opposite reaction. • For example, if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A. • The forces are exerted on different objects.

  4. Newton’s 3rd Law of Motion (cont.) Examples: • Swimming- arms push against water, water pushes swimmer ahead • Rocket Propulsion- hot gases produced by burning fuel are pushed out of the engine’s nozzle, pushing the rocket or car ahead

  5. Momentum: • Related to the amount of force that is needed to change the motion of a moving object.Which is more difficult to stop… a semi-truck or VW Beetle? *** Depends on velocity and mass • Increase in mass or velocity results in an increase in momentum. • Law of Conservation of Momentum: The total amount of momentum in a system is conserved.

  6. Momentum Sports Example • Football linemen- hard to start moving, hard to stop moving!

  7. Momentum: Equation: Momentum = Mass x Velocity SI Units: kg x m/s (and direction) p = mv

  8. Momentum Problem What is the momentum of a 10.0 kg bowling ball moving down a bowling alley at 6.0 m/s? Known:m = 10.0 kg v = 6.0 m/s Unknown:p = ___kg x m/s Formula: p = mv p = 10.0 kg x 6.0 m/s = 60 kg x m/s

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