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Forces Chapter 4 summary

by: Jennifer Notetaker

Forces Chapter 4 summary PHYS2070

Jennifer Notetaker
GPA 3.0
General Physics I
Dr. Scott Lee

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About this Document

This talks about the types of forces and motion.
General Physics I
Dr. Scott Lee
Class Notes
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This 2 page Class Notes was uploaded by Jennifer Notetaker on Thursday September 17, 2015. The Class Notes belongs to PHYS2070 at University of Toledo taught by Dr. Scott Lee in Summer 2015. Since its upload, it has received 35 views. For similar materials see General Physics I in Natural Sciences and Mathematics at University of Toledo.

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Date Created: 09/17/15
Jennifer Egbo Physics Chapter 4 Summary Recitation 3 In the text this chapter talks about Forces A force is a push or pull upon an object resulting from the object39s interaction with another object Whenever there is an interaction between two objects there is a force upon each of the objects When the interaction ceases the two objects no longer experience the force Forces only exist as a result of an interaction Force is a vector quantity having both magnitude and direction There are two types of forces First is Contact force and the second is Field force Contact force is the force in which an object comes in contact with another object Contact forces are also direct forces Contact forces are ubiquitous and are responsible for most visible interactions between macroscopic collections of matter Pushing a car up a hill or kicking a ball or pushing a desk across a room are some of the everyday examples where contact forces are at work Field forces are those types of forces that result even when the two interacting objects are not in physical contact with each other yet are able to exert a push or pull despite their physical separation Force is a quantity that is measured using the standard metric unit known as the Newton abbreviated by an N The chapter further discussed Newton s laws of motion Newton s First Law states that an object at rest or moving in uniform straight line motion with a constant velocity stays at rest or moving in uniform straight line motion unless acted on by a nonzero net external force The net external force is the sum of the vectors of all the external forces exerted on the object There are two kinds of forces that objects undergo External and Internal forces on objects External force is any force that is gotten from the interaction between the object and its environment while internal force is force that is gotten within the object itself and it cannot change the object s velocity Inertia is the resistance of any physical object to any change in its state of motion including changes to its speed and direction or the state of rest It is the tendency of objects to keep moving in a straight line at constant velocity It can also be defined as the act of an object to continue in its original motion in the absence of force Mass is a property of a physical body which determines the strength of its mutual gravitational attraction to other bodies its resistance to being accelerated by a force and in the theory of relativity gives the mass energy content of a system The SI unit of mass is the kilogram kg The larger the mass of an object the slower it accelerates under a given force Mass is also a scalar quantity Newton s Second law of motion states that The force acting on an object is equal to the mass of that object times its acceleration therefore the acceleration of an object is directly proportional to the net force acting on it and is inversely proportional to its mass Weight is a body39s relative mass or the quantity of matter contained by it giving rise to a downward force the heaviness of a person or thing Weight is mass times acceleration due to gravity Weight depends on gravity and it is not an inherent property of an object Newton s third law of motion states that for every action there is an equal and opposite reaction Equilibrium when a object is is either at rest or moving with constant velocity with a net force of zero A zero net force means that the object is not accelerating but still moving The last topic discussed in this chapter is Friction Friction is the force that opposes the motion of an object Static friction is generally more than the force of kinetic friction


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