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by: Udbluehen03

Newton_s_laws_of_motion.pdf PHYS201012

Marketplace > University of Delaware > PHYSICS (PHY) > PHYS201012 > Newton_s_laws_of_motion pdf

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These notes cover all the newton's laws of motion
Introductory Physics I
Class Notes
Physics, newton's laws
25 ?




Popular in Introductory Physics I

Popular in PHYSICS (PHY)

This 3 page Class Notes was uploaded by Udbluehen03 on Saturday October 1, 2016. The Class Notes belongs to PHYS201012 at University of Delaware taught by Gogoladze,Ilia in Summer 2016. Since its upload, it has received 6 views. For similar materials see Introductory Physics I in PHYSICS (PHY) at University of Delaware.


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Date Created: 10/01/16
Dr. Ilia Gogoladze Physics by Walker, 4 edition Force - A push and pull - Forces are what cause any change in the velocity of an object Classes of Forces - Contact forces o Involve physical contact between two objects - Field forces o Act through empty space. o No physical contact is required Fundamental Forces - Gravitational force o Between objects - Electromagnetic forces o Between electric charges - Strong force o Between subatomic particles (quarks, gluons) - Weak forces o Between subatomic particles Forces - A spring can be used to calibrate the magnitude of a force. - Doubling the force causes double the reading on the spring. - When both forces are applied, the reading is three times the initial reading. Mass - Measures the difficulty in accelerating an object - Inherent property of an object. - Independent of the object’s surroundings. - Independent of the method used to measure it. - SI unit: Kg Inertia - The resistance of any physical object to any change in its state of motion, including changes to its speed and direction. Dr. Ilia Gogoladze th Physics by Walker, 4 edition - It is the tendency of objects to keep moving in a straight line at constant velocity Newton’s First Law of Motion - An object at rest remains at rest as long as no net force acts on it - The law of Inertia: an object moving with constant velocity continues to move with the same speed and in the same direction as long as no net force acts on it - If the net force on an object is zero, its velocity is constant - no force acts on an object, the acceleration of the object is zero - The First Law also allows the definition of force as that which causes a change in the motion of an object Newton’s Second Law of Motion - Unbalanced forces cause acceleration - Acceleration is proportional to force o The greater the force, the greater the acceleration - Acceleration is inversely proportional to mass o The greater the mass, the less the acceleration - ???? = ???????? - An object may have several forces acting on it; the acceleration is due to the net force o ∑ ???? = ???????? - ∑ ????is the net force - Newton’s II Law in terms of components o ∑ ????????= ???????? ???? o ∑ ????????= ???????? ???? o ∑ ????????= ???????? ???? - The SI unit of force is the newton (N). o 1 N = 1 kg·m / s Free-body diagrams A free-body diagram shows every force acting on an object. - Sketch the forces - Isolate the object of interest - Choose a convenient coordinate system Dr. Ilia Gogoladze th Physics by Walker, 4 edition - Resolve the forces into components - Apply Newton’s second law to each coordinate direction Newton’s Third Law of Motion Law of action and reaction - Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. - Rule to Identify Action and Reaction: o Action: object A exerts a force on object B o Reaction: object B exerts a force on object A


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