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d_forces1 - PHYS 81 GY 1st Sem 2009-2010 AKGTapia Forces...

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PHYS 81 GY - 1st Sem 2009-2010 AKGTapia 1 Forces and Newton Forces and Newton ’s s Laws Laws Mechanics Study of motion in response to forces Kinematics - d eals with motion How? Dynamics - d eals with the causes of motion Why? The use of a parachute enables the decrease of acceleration with increasing the air resistance (Drag force). As the parachuters go down, they reach terminal velocity due to air resistance. Sir Isaac Newton • Derived Newton’s laws of motion • Invented calculus • Performed experiments regarding light and color. • Stated his ideas in his book- ”Philosphiae Naturalis Principia Mathematica” Classical or Newtonian Mechanics • Theory of motion based on the ideas of mass and force and the laws connecting these physical concepts to the kinematics quantities • Applies only in inertial frames Force (Puwersa) • The influence on an object that causes the object to change its velocity or to accelerate. • Described by the 1 st and 2 nd Laws of Newton “Push or pull” Force Mass • An intrinsic property of an object that measures its resistance to acceleration. • Measure of inertia (reluctance to change in velocity) M=10 kg Question : Can you judge the mass of an object by its size? No, because different objects have different densities.

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PHYS 81 GY - 1st Sem 2009-2010 AKGTapia 2 First Law: The Law of Inertia • A body continues in its initial state of rest or motion with uniform velocity unless it is acted on by an unbalanced, or net external force. = F F net • With respect to frame S the box is moving with a velocity same as the velocity of the cart. • The first law does not apply with an accelerating frame such as the cart. Questions 1. If an object has no acceleration ( a = 0), can you conclude that no forces are acting on it? • No 2. If the velocity of a body is zero, are there any forces acting on it? • Yes 3. Is it possible for an object to round a curve without any forces acting on it? • No Weight: Force due to Gravity • The most common in our everyday experience • The force of the gravitational attraction of the earth for an object. • A body freely-falling is accelerating with a
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d_forces1 - PHYS 81 GY 1st Sem 2009-2010 AKGTapia Forces...

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