Newton’s 3 rd Law

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# Newton’s 3 rd Law - PowerPoint PPT Presentation

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 &amp; opposite reaction

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### Newton’s 3rd 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
• 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 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
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)
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