Le WORK AND ENERGY Show!!!. Work is defined as a force that moves through a distance. The equation used to calculate work is: W=f d If the 60kg cart is.

Slides:



Advertisements
Similar presentations
Work and Energy By Mr Leavings Chapter 5. What is Work In science Work has a specific meaning. If you push a box with a force of one newton for a distance.
Advertisements

Work, Potential Energy, Kinetic Energy & Power
Energy Problems Review for Potential energy, Kinetic energy, Total Energy work, power.
Unit 5-2: Energy. Mechanical Energy When mechanical work is done, mechanical energy is put into or taken out of an object. Mechanical energy is a measurement.
ENERGY TRANSFORMATION. ● The Law of Conservation of Energy states that energy cannot be created nor destroyed. ● Energy can be transformed from one form.
Regents Physics Work and Energy.
Chapter 7 Energy, Part 1 Work Power Mechanical Energy Potential Energy
Energy Chapter 4.
Energy.
Conservation of Energy. What Is Energy? Energy makes change possible. Science definition: Energy is the ability to do work Measured in Joules, J. Just.
Chapter 12: Energy & Work Unit Integrated Science I.
ENERGY Part I.
ENERGY Work.
Chapter 11.  Kinetic Energy – energy of motion  Formula:KE = 1/2mv 2  Units of KE =the joule  m = mass in kg  v = velocity in m/s.
Physics Chapter 11 Energy.
Unit 5 Mechanical Principles and Applications
Energy and Conservation Physics Chapter 5-2 (p ) Chapter 5-3 (p )
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.
"The ability of a body to perform work is, Energy". The unit of energy is, joule (J). Larger unit of energy is kilo joule (kJ). 1 kJ = 1000 J. There are.
Regents Physics Work and Energy. Energy and Work Energy is the ability to Work Work is the transfer of energy to an object, or transformation of energy.
Work and Energy.
CHAPTER 10 WORK, ENERGY, AND POWER. STANDARDS SP3. Students will evaluate the forms and transformations of energy. a. Analyze, evaluate, and apply the.
Energy Chapter 7.
Energy and work Sections 12, 13, 14 and 15
Sub title Potential Energy Work Work- Energy Theorem Kinetic Energy Power 200 Work-Power-Energy.
Energy, Work & Power: Types of Energy The following are some examples of types of energy: Internal energy Gravitational potential energy = mgh Kinetic.
Work (Pay special attention to words in BLACK) What is “Work”? According to physics… Work is a force applied for a certain distance. W=F  x.
WORK, ENERGY AND POWER WHY ARE WE WORKING SO HARD?
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.
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.
Unit 8 (Chapter 10 & 11) Work, Energy and Power. Work “Work” means many things in different situations. When we talk about work in physics we are talking.
The ability to make something happen, to create a change
Understanding Work, Energy,
Work, Power & Energy How do they relate? (Stone, Ebener, Watkins)
Energy in Motion 8SCIENCE. How is energy related to motion? Energy of matter in motion is called kinetic energy – Energy is the ability to cause a change.
Work Kinetic Energy Work – Energy Theorem Gravitational Potential Energy Mechanical Energy Conservation of Energy Work Kinetic Energy Work – Energy Theorem.
ENERGY Objectives: After completing this module, you should be able to: Define kinetic energy and potential energy, along with the appropriate units.
Physics Section 5.2 Define and apply forms of mechanical energy. Energy is the ability to do work. Kinetic energy is the energy of an object due its motion.
 Work  Energy  Kinetic Energy  Potential Energy  Mechanical Energy  Conservation of Mechanical Energy.
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.
Class WORK 4/28/16 Throughout the PowerPoint ( review of Energy there were 7 questions Follow the PowerPoint lecture to answer the questions. The 7 questions.
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?
Chapter 5 Work and Energy. Question A crate of mass 10 kg is on a ramp that is inclined at an angle of 30⁰ from the horizontal. A force with a magnitude.
Vocabulary Work Problems Potential Energy Problems Kinetic Energy Problems Extra Questions
Unit 7: Work, Power, and Mechanical Energy.
General Physics February 6, 2017
POTENTIAL AND KINETIC ENERGY HOMEWORK SOLUTIONS January 17, 2017
Rearranging equations
August 16, 2017 Standard: S8P2a, S8P2b
Energy. Energy Energy (def.) the ability to do work. Unit is Joules. Work and energy are interrelated. Work must be done on an object to get it to.
Work and Energy.
Unit 10 Work, Power, & Energy.
Potential and Kinetic Energy
Energy Chapter 4.
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.
Energy IN = Energy OUT Means ALL Energy
November 23, 2015 Work and Power Quiz moved to Dec. 1
Work-Energy Theorem Energy is the ability to do work.
April 7, 2009 Study for 5 min for your quiz.
What is energy? ENERGY is the ability to make things move or change
Work and Energy.
**Bring up your Work and Power Lab to hand in for credit!**
Bell Work Turn in lab Solve the following:
Chapter 5 Review.
Kinetic and Potential Energy
Mechanical Energy.
Energy IN = Energy OUT Means ALL Energy
Work and Energy Notes on Chapter 5.
Objectives Define work in terms of energy.
Mechanical Energy.
Presentation transcript:

Le WORK AND ENERGY Show!!!

Work is defined as a force that moves through a distance. The equation used to calculate work is: W=f d If the 60kg cart is moved 20m to the right by a force of 300N, the work done to move the cart this distance is: W=fd W=300N x 20m W= 6000Nm

Here is another situation in which work is done against gravity. Here the cart is pulled or pushed up a hill to a height of 20m. The force being lifted is the weight of the cart. So if we are to determine the work done we must first determine the weight of the cart. F w = ma g F w = 60kg x 9.80m/s 2 F w = 588N W = fd W= 588N x 20m W=11760Nm

ENERGY is defined as the capacity to do work. There are many forms of energy, but two important forms are Kinetic energy and Potential energy. Kinetic energy is the energy possessed by moving masses. Kinetic energy depends on both the objects mass and the objects velocity. KE= 1/2mv 2

The 60kg cart has a velocity of 3.0m/s. The cart’s Kinetic energy is: KE= ½ mv 2 KE= ½ 60kg x (3.0m/s) 2 KE= 270Nm or 270Joules ( 1 Joule is equal to 1Nm)

Potential energy is energy that is stored and is available for use at some time in the future. There are a number of forms of potential energy…One form is Gravitational Potential Energy. GPE is the energy that is stored by an object because of its position above a surface. Remember the cart that climbed the hill?

The gravitational potential energy stored by the cart when it is at the top of the hill is determined using the equation GPE=mgh GPE=60kg x 9.80m/s 2 x 20m GPE= 11760Joules

Doing work requires energy. In a real sense this means that energy and work are always equal to each other. When work is done moving a force through a distance, energy is consumed. W = fd W= 588N x 20m W=11760Nm GPE= mgh GPE = 60kg x 9.8m/s2 x 20m GPE = 11760Nm or Joules Note that the work done and the energy stored are the same.

Energy is conserved. This means that energy is never destroyed or lost, it only changes from one form to another. Here is an example of how this happens. When the barrel is rolled to the top of the ramp the GPE stored is: GPE=mgh GPE= 30kg x 9.80m/s2 x 3.0m GPE= 882 J

When the barrel falls off the top of the ramp the GPE is changed into Kinetic energy and then into heat and sound The energy is CONSERVED.

The Law of Conservation of Energy states that energy is conserved. It is never lost or destroyed, it simply changes from one form to another.

Practice what you have learned (A “GPE” problem…) A 2.0kg pendulum swings to a height of 3.0m above its resting position. How GPE does it have at this height? GPE= mgh GPE= 2.0kg 9.8m/s 2 3.0m GPE= 58.8J Remember 1Nm = 1Joule

(Another WORK DONE AGAINST GRAVITY problem) A 75kg carpenter climbs to the top of 4.0m ladder. How much work has he done? W=fd W= ( weight) distance  This is because his work is done against gravity. W= (m g) d W= (75kg 9.8m/s 2 ) 4.0m W= 2940Nm or 2940J

( A Work / energy theorem problem.) A 75kg carpenter climbs to the top of 4.0m ladder. How much work has he done? GPE=mgh GPE=75kg 9.8m/s 2 4.0m GPE= 2940J  ***The answer is the same as the previous problem: Work done = energy gained***

(Work done by a force other than gravity…) A.What is the force shown in the diagram below? F=200N B. How far did Moe push the Refrigerator? 10m C. How much work did he do pushing the refrigerator? W=fd W= 200N 10m W= 2000J

(A kinetic energy problem…) What is the kinetic energy of the.30kg ball shown here? KE=1/2mv 2 KE= ½.30kg (20m/s) 2 KE= 60J

The End…for now