Work The displacement of an object in a parallel direction to an applied force. F d W=Force x displacement Work is measured in Joules (J) which comes from.

Slides:



Advertisements
Similar presentations
Introduction to the concepts of work, energy, momentum and impulse. F = ma Ft = mat = mvFt represents impulse while mv represents momentum. These are all.
Advertisements

Work & Energy Chapter 6 (C&J) Chapter 10(Glencoe).
13-Work and Energy 1-Work, Power, and Machines Work: The transfer of energy to an Object by the application of force that Causes the object to move in.
Work and Kinetic Energy. Work Done by a Constant Force The definition of work, when the force is parallel to the displacement: (7-1) SI unit: newton-meter.
Chapter 7 Work and Kinetic Energy 7-1 Work done by a Constant Force A. Force along Displacement W = Fd Units: Nm = Joule P7.5 (p.200)
Dr. Jie Zou PHY 1151G Department of Physics1 Chapter 7 Work and Kinetic Energy.
Example: A 20 kg block is fired horizontally across a frictionless surface. The block strikes a platform that is attached to a spring at its equilibrium.
AP PHYSICS REVIEW Energy. Work  Work is when a force is applied to an object to move it a distance.  W = Fd cos( Ɵ )  Work can be done by many forces.
Chapter 7 Work and Kinetic Energy. Units of Chapter 7 Work Done by a Constant Force Kinetic Energy and the Work-Energy Theorem Work Done by a Variable.
Work. Mechanical work Applying a force on an object that displaces the object in the direction of the force.
Wednesday, 12/10/14PHYSICS If you do the same old things, you get the same old results!
Work and Power. Objectives 1.The student will investigate and understand the interrelationships among mass, distance, force and time through mathematical.
Work & Power Physics Work In Physics, Work is done when a force moves a body through a distance. WORK = Force x Displacement.
Physics 111: Mechanics Lecture 6 Wenda Cao NJIT Physics Department.
Chapter 5 Work and Energy.
Work W = the transfer of energy E W = Work done ___ a system ____________ its total energy. Work done ___ a system ____________ its total energy box pile.
Work, Power, Energy.
In this chapter you will:  Recognize that work and power describe how the external world changes the energy of a system.  Relate force to work and explain.
ENERGY Different forms; Chemical, Electrical, Heat, Electromagnetic, Nuclear and Mechanical Energy can be transformed from one type to another but the.
Chapter 5 – Work and Energy If an object is moved by a force and the force and displacement are in the same direction, then work equals the product of.
Work, Power, Energy Work.
Chapter 10 Work and Energy
Physics 3.3. Work WWWWork is defined as Force in the direction of motion x the distance moved. WWWWork is also defined as the change in total.
Unit Two: Mechanical Energy A: Work- –in everyday life, it means many things –In physics, work is “what is accomplished when a force acts on an object.
Lesson 1 unit 4. Energy Energy can be defined as the capacity to work or to accomplish a task. Example: burning fuel allows an engine to do the work of.
Work, Kinetic Energy, and Power. v f 2 = v i 2 + 2ad and F = ma v f 2 -v i 2 = 2ad and F/m = a v f 2 -v i 2 = 2(F/m)d Fd = ½ mv f 2 – ½ mv i 2 Fd = Work.
Ch. 6 Work and Kinetic Energy AP Physics C. What is work? Write your thoughts on the whiteboard, Share with your table partner, Share with the whole class.
WORK, ENERGY AND POWER WHY ARE WE WORKING SO HARD?
Work AP style. Energy Energy: the currency of the universe. Everything has to be “paid for” with energy. Energy can’t be created or destroyed, but it.
Conservation of Energy ► Energy  Work ► Kinetic and Potential Energy  Conservative and non-conservative forces  Other forms of energy.
Work has a specific definition in physics
Work and energy. Objectives 1.Recognize the difference between the scientific and the ordinary definitions of work. 2.Define work, relating it to force.
Work, Energy, and Power Chapter 5
Work is defined as the transfer of energy from one body to another. Or more rigorously:
Chapter 7 - Work and Energy
WORK AND ENERGY. QUICK REVIEW KinematicsDynamics UCM and Newton’s Law of Gravitation Studied motion but not cause of motion. Relationships between position,
Work Work is a scalar quantity and has the following conditions: a force must be exerted on an object the object must be displaced by the force at least.
WORK A force that causes a displacement of an object does work on the object. W = F d Work is done –if the object the work is done on moves due to the.
Work and Energy. Work… …is the product of the magnitude of displacement times the component of force parallel to the displacement. W = F ‖ d Units: N.
Chapter 5 Work and Energy.
WORK AP 1 chapter 6: section WORK  The product of the magnitude of the displacement times the component of the force PARALLEL to the direction.
Work&EnergyWork&Energy. 4.1 Work Done by a Constant Force.
5.4 The Work-Energy Theorem and Kinetic Energy
Pre-AP Physics.  Energy is expressed in JOULES (J)  4.19 J = 1 calorie  Energy can be expressed more specifically by using the term WORK(W) Work =
Work and Energy. Section Objectives: Define work by relating it to force and displacement. Identify where work is being performed in a variety of situations.
Energy, Work and Power. Energy Energy: the currency of the universe. Just like money, it comes in many forms! Everything that is accomplished has to be.
Work & Power Physics Work In Physics, Work is done when a force moves a body through a distance. WORK = Force x Displacement.
Work and Energy. Objectives 1.The student will investigate and understand the interrelationships among mass, distance, force and time through mathematical.
Ch.5 Energy Energy comes in various forms:. When you apply a Force to an object and it moves a displacement (x), then you get done. i.e.(Weight is now.
 Energy, Work and Simple Machines  Chapter 10  Physics I.
Copyright © 2010 Pearson Education, Inc. Lecture Outline Chapter 7 Physics, 4 th Edition James S. Walker.
Energy Notes Energy is one of the most important concepts in science. An object has energy if it can produce a change in itself or in its surroundings.
Aim: How can we apply work- energy to motion problems? Do Now: In your own words, what does energy mean to you? In your own words, what does energy mean.
Copyright © 2010 Pearson Education, Inc. Lecture Outline Chapter 7 Physics, 4 th Edition James S. Walker.
Work is only done by a force on an object if the force causes the object to move in the direction of the force. Objects that are at rest may have many.
1 PhysicsChapter 5 Work & Energy Sections:15-1 Work 5-2 Energy 5-3 Conservation of Energy 5-4 Work, Energy & Power.
Work and Energy Chapter 5. Work In physics: “the amount of energy transferred from one object to another” Measured in Joules (J) Mathematically: W = Fd.
Work, Power Problems Answers
Work.
Work and Energy SPH3U.
Work, Energy, and Power.
Work is only done by a force on an
Work.
Unit 5 Work, Power, and Energy.
Work.
The Work Energy Principle Part 6
Chapter 5 Pgs
Work is measured in Joules (J)
Work and Energy Chapter 5 Physics.
Work Work is done when a force is exerted on an object and the object moves a distance x. Work = force ·distance W = F · d units: N·m = Joule Work is.
Presentation transcript:

Work The displacement of an object in a parallel direction to an applied force. F d W=Force x displacement Work is measured in Joules (J) which comes from a Newton-meter (Nm). The fundamental units that make up a Joule are kgm 2 /s 2 W=Fd Work is a scalar quantity. The force and displacement must be in parallel directions.

Vertical Work F W F=W for a mass lifted at constant velocity Vertical Work: Work=(weight)(Δh) d=change in height=final height –initial height hihi hfhf d

d F No work is accomplished by force F in this situation.

Work Also defined as a transfer of energy. Also defined as a transfer of energy. Whenever work is accomplished, energy of some type is transferred. Whenever work is accomplished, energy of some type is transferred.

Work by various components F f d W F =Fd Work accomplished by force, F moving a distance d W f = -fd Work accomplished by friction through a distance, d. Constant velocity Net work is zero Wnet=Fnet(d)=(F-f)d=Fd-fd=W F -W f =0 Acceleration Wnet=Fnet(d)=mad=(F-f)d=W F -W f

F d Work is positive when the force and displacement are in the same direction. F d Work is negative when the force and displacement are in opposite directions. Positive work: Work is accomplished by the force. Energy in transferred into the system Negative work: Work is accomplished on the force. Energy is transferred out of the system

Work is the area under a force-displacement graph. Work is the area under a force-displacement graph.

Power Power is the rate of doing work. Power is the rate of doing work. Power is the rate of energy transfer. Power is the rate of energy transfer. Power =Work/time  P= W/t Power =Work/time  P= W/t Power = (F)(d)/t = F(d/t) Power = (F)(d)/t = F(d/t) Power = Force x velocity  P=Fv Power = Force x velocity  P=Fv v = average velocity (v f +v i )/2 v = average velocity (v f +v i )/2 P  (N)(m)/s= (J)/(s)=(kgm 2 /s 3 ) = Watt P  (N)(m)/s= (J)/(s)=(kgm 2 /s 3 ) = Watt Power is measured in Watts, abbreviated W. Power is measured in Watts, abbreviated W. 1 horsepower = 746 Watts (1 hp =746 W) 1 horsepower = 746 Watts (1 hp =746 W)

Work in Various Directions d

Situation 1 d An object pulled at an angle on a level horizontal surface. F FxFx W=(Fcosθ)d W=F x d The applied force F and d are not in a parallel direction. F x =Fcosθ

Situation 2 x W h θ Given: W, x, θ h=xtanθ Work=Wh=Wxtanθ

Situation 3 x F d θ Given: F, x, θ d=x/cosθ W=Fd

Situation 4 F d θ Given: F, d, θ F !! =Fcosθ W=F || d=Fdcosθ or θ x x=dcosθ W=Fx W=Fdcosθ F ||

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.