Energy and Work Part 2. What is Work Work is the transfer of energy through motion –When force acts over a distance in the direction of an object’s motion.

Slides:



Advertisements
Similar presentations
Physics Energy.
Advertisements

Physics Energy. Law of Conservation of Energy energy cannot be created or destroyed only transferred from one form to another Electric  LightChemical.
Energy Problems Review for Potential energy, Kinetic energy, Total Energy work, power.
Energy.
It takes work to lift a mass against the pull (force) of gravity The force of gravity is m·g, where m is the mass, and g is the gravitational acceleration.
Mechanical Energy By: Alicia Strickler Sarah Swartz.
Work, Energy, and Power Chapter 4. Work WORK = the use of force to move an object a certain distance. You do work ONLY when you exert a force on an object.
Chapter 12: Energy & Work Unit Integrated Science I.
Notes on Chapter 8 Work & Energy
Chapter 6 Work, Energy, Power Work  The work done by force is defined as the product of that force times the parallel distance over which it acts. 
Work, Energy, Power. Work  The work done by force is defined as the product of that force times the parallel distance over which it acts.  The unit.
Work Kinetic Energy Potential Energy. Work is done when There is an application of a force There is movement of something by that force Work = force x.
Chapter 4. The nature of energy Energy: The ability to do work or cause change All energy involves either motion or position Where are we using energy.
Energy Review of Chapter 4. Energy Energy can neither be created or destroyed Law of Conservation of Energy Law of Conservation of Energy We can only.
Energy. Energy & Work Closely related Energy: ability to do work Work: transfer of energy Both measured in Joules.
ENERGY The measure of the ability to do work Conservation of energy -energy can change forms but can not be destroyed -the total amount of energy in the.
How much work does a 154 lb. student do when climbing a flight of stairs that are 6 meters in height and 30 meters in length? If the stairs are climbed.
Work, Power, and Machines
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 7: Energy. Bell Ringer.
Work and Energy.
Welcome to Jeopardy. Round 1 WorkPEKEPowerEnergy
Motion and Forces Work and Energy Chapter 4. Bell Work 2/18/10 Write each statement, then decide if the statement is true or false, if false correct it.
The BIG idea Energy is transferred when a force moves an object. Work and Energy Work is the use of force to move an object. 4.1 Energy is transferred.
Work & Energy Chapter 12 Notes. Work / Work has a specific meaning in science - Work is done when a force causes a change in the position of an object.
Work, Power and Energy. WORK Is the product of force and distance Work is done when a force acts on an object in the direction the object moves. No movement,
Conservation of Energy. The Law of Conservation of Energy Energy cannot be CREATED or DESTROYED. Energy is just CONVERTED from one form to another.
Work, Power and Energy.
CHAPTER 8 ENERGY. Energy What is energy? You can see its effects, but it can be difficult to understand. First, let’s look at a closely related concept:
Energy, Work, and Transfer of Energy Physical Science Chapter 12.
Conservation of Energy IT’S THE LAW. Lifting a Ball When you lift a ball to a certain height you __________________. This work (W) is equal to the weight.
Chapter 5: Work and Energy. Today’s Objectives What do you think? List five examples of things you have done in the last year that you would consider.
Types of EnergyForms of Energy Law of Conservation of Energy Work Renewable and Nonrenewable Sources.
The ability to make something happen, to create a change
Energy and its Conservation
Work, Power & Energy How do they relate? (Stone, Ebener, Watkins)
Ch. 4 - Energy I. Energy and Work (p )  Energy  Work  Conservation of Energy.
Conservation of Energy IT’S THE LAW. Lifting a Ball When you lift a ball to a certain height you do work on it. When you lift a ball to a certain height.
Energy and Power We think about it all the time….
State Assessment Review 2.HS.2B.2.2.  work – the transfer of energy to a body by the application of a force that causes the body to move in a direction.
Work and Energy 1.What is work? 2.What is energy? 3.What does horsepower and torque of an engine tell you about a car?
Vocabulary Work Problems Potential Energy Problems Kinetic Energy Problems Extra Questions
Energy (REVIEW). Two Forms of Energy Kinetic Energy – of MOTION KE = ½ mv 2 Potential Energy – Energy of POSITION PE = mgh (gravitational PE) (g = 9.8.
Unit 5: Work, Power and Energy. Work Work is done when a force causes a change in motion of an object, or work is a force that is applied to an object.
WORK, POWER, AND MACHINES 9.1. WORK  A quantity that measures the effects of a force acting over a distance  Work = force x distance  W = Fd.
Energy and Energy Resources Pages 240 to 247
Energy.
IS Jeopardy Work Power Energy Misc Potpourri
PE Definition Stored Energy Energy due to position.
Work and Energy.
Unit 10 Work, Power, & Energy.
I. Energy and Work (p ) Energy Work Conservation of Energy
Think Pair Share As the girl swings back and forth, describe her potential energy and kinetic energy at A, B, and C. A C B.
I. Energy and Work (p ) Energy Work Conservation of Energy
Energy.
Conservation of Energy
Energy Conversion and Conservation
Energy and Energy Resources Pages 240 to 247
Work-Energy Theorem Energy is the ability to do work.
Work and Energy.
Physical Science Ch. 15: Energy.
Chapter 4 Work and Energy
Work and Power.
I. Energy and Work (p ) Energy Work Conservation of Energy
Mechanical Energy.
Objectives Define work in terms of energy.
Let’s Play! Please listen carefully and think before answering.
Ch 4 Energy Kinetic Energy (KE) – the energy a moving object has because of its motion; depends on mass and speed of object KE = mv2/2 Joule – SI unit.
GRAVITATIONAL POTENTIAL & KINETIC ENERGY
Presentation transcript:

Energy and Work Part 2

What is Work Work is the transfer of energy through motion –When force acts over a distance in the direction of an object’s motion W = F x D W = Work F = Force D = Distance W = Work F = Force D = Distance Measured in Joules (J) J = N x m Measured in Joules (J) J = N x m

Example A dancer lifts a 400 N ballerina overhead a distance of 1.4 m and holds her there for several seconds. How much work is done during the lift? W = F x D F = 400 N D = 1.4 m W = 400N x 1.4m W= 560 J or 560 N x m How much work was being done while the ballerina was overhead?

Why was no work being done while the ballerina was overhead? Work – transfer of energy through motion If the ballerina is not moving what type of energy does she represent –Potential What if she was dropped. What type of energy would she represent? –Kinetic

Conservation of Energy Law of Conservation of Energy –Energy may change form but it cannot be created nor destroyed under ordinary conditions

Calculating Kinetic Energy Kinetic Energy - KE =1/2 x M x V 2 –Example: Determine the kinetic evergy of a 25 kg roller coaster car that is moving with a speed of 18.3 m/s KE = ½ x 25 kg x KE = 4186 Joules

Calculating Potential Energy Potential Energy – PE grav =mgh –m = mass –g = gravitational acceleration –h =height –A 4 kg book is placed on a shelf 3 meters above the ground. What is the potential energy of this book? PE grav = 4kg x 9.8 m/s 2 x 3 m PE grav = Joules

Mechanical Energy Mechanical Energy – is the total amount of kinetic and potential energy in a system

Mechanical Energy A B C D E At what points do you have the greatest potential energy? Answer: A and E At what point do you have increasing/decreasing potential energy? Answer: B (decreasing) and D (increasing) At what point do you have the greatest kinetic energy? Answer: C At what point do you have increasing/decreasing kinetic energy? Answer: B (increasing) and D (decreasing)

Power The rate at which work is done. Measure of the amount of work done in a certain amount of time. –Calculating Power: power = Work/Time p = W/t

Calculating Power The units for power are Watts –Watts = 1 joule per second Work = Joule Time = second –Hence Watts = Joule/Second –Example: A figure skater lifts his partner, who weighs 450 N, 1.0 m in 3.0 s. How much power is required?

Solution What is known? F = 450 N F = 450 N D = 1.0 m D = 1.0 m T = 3.0 s T = 3.0 s What is not known? W = ? W = ? W = f x d W = 450 N x 1.0 m W = 450 J Now you can calculate power: p = 450 J/3.0 s p = 150 W

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

© 2024 SlidePlayer.com Inc. All rights reserved.