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Newton’s Laws

Newton’s Laws. Sir Isaac Newton. Studied physics in the late 1600’s Developed laws about force and gravity Discovered that a prism could separate light into the color spectrum and vice-versa and proved that color is a property of light Founded calculus. Newton’s First Law.

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Newton’s Laws

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  1. Newton’s Laws

  2. Sir Isaac Newton • Studied physics in the late 1600’s • Developed laws about force and gravity • Discovered that a prism could separate light into the color spectrum and vice-versa and proved that color is a property of light • Founded calculus

  3. Newton’s First Law • An object at rest stays at rest and an object in motion stays in motion unless acted on by an outside unbalanced force. • Think about slamming on the brakes in the car – the car slows down, but you don’t – locks the seatbelt.

  4. Inertia • Inertia – the tendency of an object to resist a change in its motion • In order to overcome an object’s inertia, a force must be exerted on the object. Greater mass=greater inertia • Newton’s 1st Law is also called the Law of Inertia • Newton's First Law of Motion

  5. Newton’s Second Law • Force equals mass x acceleration F=ma • Explains how objects behave when forces are unbalanced

  6. Newton’s Third Law • Forces come in pairs • For every action, there is a reaction

  7. Newton’s Third Law • Think about • A rocket being launched • Newton's 3rd Law

  8. Galileo • Galileo was a scientist who studied math and physics in the late 1500’s and early 1600’s in Italy • He showed that objects with unequal masses would fall to the ground at the same time by doing an experiment at the Leaning Tower of Pisa • Galileo Drops the Ball

  9. Mass and Weight Mass is the amount of matter in an object – usually measured in g or kg Mass does not change with gravity Weight is the force of gravity on an object – measured in N Weight changes with gravity, so it can be different in different places

  10. Calculating Weight Fg=weight Fg=mg This formula is on your reference table The value of g is on your reference table

  11. Calculating Weight An object with a mass of 12kg on Earth will have a mass of 12kg on the moon. Calculate the weight of the object on earth. Fg=mg Fg=12kg · 9.8m/s2 = 117.6N

  12. Calculating Weight An astronaut has a mass of 90kg. Find his weight if he is in a flight simulator with a gravitational pull of 1.0m/s2. Fg=mg Fg=90kg · 1.0m/s2 = 90N

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