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Chapter 5: Newtons Laws

by: Rebeka Jones

Chapter 5: Newtons Laws PHSX 205-001

Marketplace > Montana State University > PHSX 205-001 > Chapter 5 Newtons Laws
Rebeka Jones
GPA 2.53

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Chapter notes on Newtons Laws. Includes chapter formulas.
College Physics I
Dr. Greg Francis
Class Notes
25 ?




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This 3 page Class Notes was uploaded by Rebeka Jones on Saturday October 15, 2016. The Class Notes belongs to PHSX 205-001 at Montana State University taught by Dr. Greg Francis in Fall 2016. Since its upload, it has received 5 views.


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Date Created: 10/15/16
Chapter 5: Newton’s Laws The goal of mechanics is to take what is known about a system of objects and to there by determine what acceleration of each of those object will be. Principle of inertia – a body moving on a level surface will continue in th e same direction at constant speed unless disturbed Law I: Every body preserves in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed on it. All objects move at constant velocity: unless acted upon by an outside force Newton’s first law simply does not apply in a reference frame that is accelerating; it only applies in frames where it applies. So it is merely a definition. The reference systems where Newton’s first law applies are called inertial frames, and they are defined as those frames in which Newton’s first law applies. If you see all objects with no forces on them move at a constant velocity then you are in an inertial frame, and Newton ’s first law will work. *reference frames tied to the earth may be assumed to be an inert ial frame to high accuracy. The quantity of motion is the way to measure motion, arising as the product of mass and velocity. Now called momentum. Law II: The change in motion is always proportional to the applied force, and is made in the direction of the straight line in which that force is applied. ???? = ???????? ma is proportional to the force, not equal 2 The force unit is Newton 1 N = 1 kg x m/s Mass is a measure of an objects inertia of how difficult it is to accelerate the object – mas is scalar, it has no direction ???????????? ????????: ???? ▯▯▯ = ???????? Law III: To every action there is always opposed an equal and opposite reaction: or the mutual actions of two bodies are always equal, and directed to contrary parts. Easier version Law III: If an object exerts a force on a second object, the second object exerts an equal and opposite force back on the first object. The point of Newton’s 3 law is that forces always occur in pairs. When labeling forces use by,on subscripts Gravitational Force: W = mg *gravity acts on an object without anything touching the object Normal Force – can only arise when something is touching the object Friction Force – when the surface of the object is pulled along or is moving along another surface - Kinetic – when an object is in motion across the surface 2 - Static 0 what it takes to keep the object from moving Tension – created by strings, chains, cords, etc. Drawing a free body diagram should always be the first step in solving a problem involving Newton’s second law. Once we have identified the forces, we are able to apply Newton’s second law to the problem, Chapter Formulas ???? ▯▯▯ ???????????????????????? ???? ???????????????????????? ???????????? ∶ ???? ▯▯▯ = ???????? ???????? ???? ???? ???? = ???????? 3


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