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by: Iva Cormier

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# Intro Physics Surv PHYS 1030

Iva Cormier
ETSU
GPA 3.97

Brian Espino

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COURSE
PROF.
Brian Espino
TYPE
Class Notes
PAGES
12
WORDS
KARMA
25 ?

## Popular in Physics 2

This 12 page Class Notes was uploaded by Iva Cormier on Sunday October 11, 2015. The Class Notes belongs to PHYS 1030 at East Tennessee State University taught by Brian Espino in Fall. Since its upload, it has received 17 views. For similar materials see /class/221406/phys-1030-east-tennessee-state-university in Physics 2 at East Tennessee State University.

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Date Created: 10/11/15
Ch 4 Why things move 0 Force external influence that causes a body to accelerate A force is an action that one object does to another examples Pulling on a rope produces a tension force The mass of the earth pulls down on you producing your weight more examples of forces 0 friction from two rough surfaces rubbing against each other air and water resistance similar to friction an object experiences these with its surroundings mass and inertia mass is the measurement of how much inertia an object has The more massive an object the greater the force necessa rv to accelerate it SI unit of mass is the kilogram kg F m a or a Fm SI unit of force is the newton N net force The net force is the sum of all the forces acting on an object Need to consider direction F1 39 Inet F1 Only the component of force that is parallel to the motion accelerates the object The component of gravity that is along an incline accelerates the object that goes down the incline component of weight parallel to incline The steeper the incline the larger the acceleration weight net gravitational force acting on an object by all other objects normal force a force that is exerted on one object by another by physical contact Normal means perpendicular Normal forces are perpendicular to the surface of contact Force Diagram or Free Body Diagram Shows all the forces that are acting on a object Person pulling on a box normal force tension in rope I weight The net force in each direction relates to the motion in that direction horizontalvertical 3 Newton Law s of Forces 1St law law of inertia objects at rest stay at rest and objects in motion continue their motion unless acted on by an outside force 2nOI law force is proportional to acceleration Fma 3rOI law for every force there is an equal and opposite force law of force pairs Force pairs Forces always act in pairs 0 examples are swimming jet airplane plane and boat propellers Rockets Rocket motion Rocket motion involves the law of force pairs When a rocket forces gas out of its engine it exerts a force on the gas The gas exerts an equal and opposite force on the rocket Example of being stranded on a frozen pond You can get off the ice if you behave like a rocket Gravitation 0 Force of gravity between any two objects masslxmassZ Foc 2 separation m gtltm F 67x10 11 2 See graph on page 96

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