Lect08 - Physics 101: Lecture 8 Newton's Laws q Today's...

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Physics 101: Lecture 8, Pg 1 Physics 101: Physics 101: Lecture 8 Lecture 8 Newton's Laws Newton's Laws Today’s lecture will be a review of Newton’s Laws and the four types of forces discussed in Chapter 4. Concepts of Mass and Force Newton’s Three Laws Gravitational, Normal, Frictional, Tension Forces
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Physics 101: Lecture 8, Pg 2 Sir Isaac Newton, English Physicist, 1643-1727
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Physics 101: Lecture 8, Pg 3 Newton’s First Law Newton’s First Law The motion of an object does not change unless it is acted upon by a net force . If v =0 , it remains 0 If v is some value, it stays at that value Another way to say the same thing: No net force velocity is constant acceleration is zero no change of direction of motion
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Physics 101: Lecture 8, Pg 4 Mass or Inertia Mass or Inertia Inertia is the tendency of an object to remain at rest or in motion with constant speed along a straight line. Mass (m) is the quantitative measure of inertia. Mass is the property of an object that measures how hard it is to change its motion. Units: [M] = kg
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Physics 101: Lecture 8, Pg 5 Newton’s Second Law Newton’s Second Law This law tells us how motion changes when a net force is applied. acceleration = (net force)/mass M F M F M F a : symbols in tot net = = = a M F : it write way to alternate net =
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Physics 101: Lecture 8, Pg 6 Newton’s Second Law Newton’s Second Law Units: [F] = [M] [a] [F] = kg m/s 2 1 Newton (N) 1 kg m/s 2 A vector equation: F x = Ma x a M F net =
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Physics 101: Lecture 8, Pg 7 Newton’s 1. Law Newton’s 1. Law An airplane is flying from Buffalo airport to O'Hare. Many forces act on the plane, including weight (gravity),
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Lect08 - Physics 101: Lecture 8 Newton's Laws q Today's...

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