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Newton's Three Laws of Motion

Newton's Three Laws of Motion. 4 January 1643 – 31 March 1727. Newton's First Law of Motion. An object at rest tends to stay at rest. An object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

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Newton's Three Laws of Motion

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  1. Newton's Three Laws of Motion 4 January1643 – 31 March1727

  2. Newton's First Law of Motion • An object at rest tends to stay at rest. • An object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force Inertia: The tendency of an object to keep moving at the same speed and in the same direction

  3. Newton's First Law of MotionExamples Car sudden acceleration The drink , which was at rest, wants to stay at rest. Possible result : spill

  4. Newton's First Law of MotionExamples Car going 35 miles/hr. Driver also going 35 miles/hr ( but he does not feel it : they are not moving relative to the car ). Brisk stop of the car => the driver keeps traveling 35 miles/hr until acted on by an external force : steering wheel, dashboard, windshield. Hence the importance of the Driver Seat Belt

  5. Newton's First Law of MotionExamples Head resists the motion and moves to the back rear-end collisions Hence the importance of the Driver Headrest

  6. Newton's First Law of MotionMore Examples

  7. Newton's Third Law of Motion For every action there is an equal and opposite re-action. Democrats Republicans

  8. Newton's Third Law of Motion

  9. Newton's Third Law of Motion Rockets work by pushing exhaust gases out Opposite force pushing the rocket upward Thrust force pushing downward Skateboard example

  10. Newton's Second Law of Motion F = m.a Or a = F/m F force: the push or pull on an object that in some way affects its motion m mass: the amount of matter an object has a acceleration WWeight: the force which pulls you toward the center of the Earth (or any other body)

  11. Newton's Second Law of Motion Units: [F] = [M] [a] [F] = kg m/s2 1 Newton (N)  1 kg m/s2

  12. Newton's Second Law of Motion the harder you hit a baseball, the faster the ball goes a = F/m. If you substitute the baseball with a more massive ball , ( increasing m ), it will no go far. It will take the 18 wheels truck longer time to come to stop than the smaller truck …due to their mass differences.

  13. Newton's Second Law of Motion If Then No Acceleration  * Object at rest tends to stay at rest * object in motion tends to stay in motion with the same speed and in the same direction Newton’s First Law

  14. Newton's Second Law of Motion Acceleration Due to Gravity Figure Source : http://sol.sci.uop.edu/~jfalward/physics17/chapter2/chapter2.html

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