Newton s 3 rd law
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Newton’s 3 rd Law. Physical Science Section 3.3. Newton’s third law of motion when 1 object exerts a force on a 2nd object, the 2nd object exerts a force that is equal in size and opposite in direction to the force from the 1st object For every action, there is an equal & opposite reaction

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Newton’s 3 rd Law

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Newton s 3 rd law

Newton’s 3rd Law

Physical Science Section 3.3


Newton s 3 rd law

  • Newton’s third law of motion

    • when 1 object exerts a force on a 2nd object, the 2nd object exerts a force that is equal in size and opposite in direction to the force from the 1st object

    • For every action, there is an equal & opposite reaction

  • Swimming- swimmer exerts force on water; water exerts force on swimmer

    • Action-reaction pairs act on different object

  • Rocket engine- rocket engine exerts force on the hot gases produced by the fuel

    • gases exert a force on the rocket and push it forward


Newton s 3 rd law1

Newton’s 3rd Law

  • Orbit of earth in space influenced by:

    • gravitational forces between the Sun and the Earth and between other planets and the Earth

  • Discovery of Neptune

    • Orbit of Uranus could not be explained by the planets known at the time

  • Bicycle’s easier to stop than a car- less mass

    • Less mass = less inertia and less momentum


Newton s 3 rd law

  • Object with less speed = less momentum

    • Less speed = easier to stop

  • Momentum- product of mass and velocity- influences how easily an object can be stopped

    • P = m x v

    • P : momentum Units kg*m/s2

    • Has direction because velocity has direction

    • Indicate direction of momentum

  • Force can be calculated by using the final and initial momentum when an object changes its velocity.

    • F = (mvf – mvi)/t)


Newton s 3 rd law

  • Law of conservation of momentum- total momentum does not change in a collision

    • Momentum before collision = momentum after collision

  • 2 objects collide when moving in the same direction

    • first object slows and the second speeds up in the same direction

  • 2 objects collide when moving in opposite directions with the same momentum

    • Start with 0 momentum, collide, bounce off in opposite directions, still have 0 momentum


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