Upload File

energy lecture slide 1 energy conservation. energy can be thought of as the capacity for doing work...

  • Home
  • Documents
  • Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy
27
Energy Lecture Slide 1 Energy Conservation

Upload: mikaela-simpson

Post on 15-Dec-2015

216 views

Category:

Documents


1 download

Report

Tags:

TRANSCRIPT

Page 1: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Lecture Slide 1

Energy Conservation

Page 2: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Conservation

• Energy can be thought of as the capacity for doing work

• Energy may be transformed from one type of energy to another.– Kinetic, potential, “heat”, work

• Energy can be neither created nor destroyed

Energy Lecture Slide 2

Page 3: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Lecture Slide 3

Energy Conservation• The total energy of a system is

constant.

• That is, the sum of the PE + KE + other types of energy = constant

• If PE decreases, KE increases … and vice versa

Page 4: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Lecture Slide 4

Page 5: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Lecture Slide 5

Pendulum Energy

Page 6: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Pendulum Energy

Energy Lecture Slide 6

Page 7: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Pendulum Answers

• A: h = 0.306 m (6 J = 2 kg *9.8 m/s/s * h)• B: h = 0.153 m (3 J = 2 kg *9.8 m/s/s * h)• C: v = 1.73 m/s (3 J = 0.5 * 2 kg * v2)• D: h = 0 m (0 J = 2 kg * 9.8 m/s/s*h)• E: v = 2.45 m/s (6 J = 0.5 * 2 kg * v2)• F: h = 0.306 m (6 J = 2 kg * 9.8 m/s/s * h)

Energy Lecture Slide 7

Page 8: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Roller Coaster Energy

Energy Lecture Slide 8

Page 9: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Lecture Slide 9

Roller Coaster Energy

• First hill must be highest• What impact does friction have on the

height of the successive hills?

Page 10: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Roller Coaster

Energy Lecture Slide 10

Page 11: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Ski Jumper Energy

Energy Lecture Slide 11

Page 12: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Lecture Slide 12

Simple Machines

• If no friction, then• Work Input = Work Output

• Inclined plane

• Pulley

• Lever

Page 13: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Why Use a Machine?

• If there is no friction,– Work done on the machine (work input) is

equal to the work done by the machine (work output)

• and … when there is friction,– work input > than work output

• So why do we use machines?

Energy Lecture Slide 13

Page 14: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Lecture Slide 14

Inclined Plane

• Output work = work done if you didn’t use the machine– Output work = (weight of load)(vertical height)

• Input work = work done using machine– Input work = (force exerted)(length of plane)

Page 15: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Inclined Plane Problem

Energy Lecture Slide 15

• What work would be done by the man if he lifted the block vertically upward 3m?

• How does this relate to the change in potential energy of the block?

The mass of the block of ice is 50 kg.

Page 16: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Inclined Plane Problem

Energy Lecture Slide 16

• What work would be done by the man if he slid the block along the incline to the top?

• What force would the man have to use to move the block at a constant speed along the ramp?

The mass of the block of ice is 50 kg.

Page 17: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Ramps & Energy Conservation

• What is the speed of the block at the bottom of each of the 5 m high ramps? Ignore friction. Use g = 10 m/s/s.

Energy Lecture Slide 17

Page 18: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Lecture Slide 18

Pulley

• Mechanical Advantage of Single Pulley is 1• Single pulley changes direction of force

Page 19: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Pulley Systems

Energy Lecture Slide 19

Compound Pulleys can multiply force.

Page 20: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Window Washer• The window washer

has a mass of 75 kg and the platform plus the bucket and squeegee has a mass of 25 kg.

• What force does the washer have to exert to lift himself and the platform?

Energy Lecture Slide 20

• What length of rope will he have to pull in order to lift himself 12 m?

Page 21: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Lecture Slide 21

Lever

Page 22: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Lecture Slide 22

Mechanical Advantage

• Ideal Mechanical Advantage

Forcewithout machineAMA

Forcewithmachine

Distance

Distance

withmachineIMA

without machine

AMAefficiency

IMA

Page 23: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Lecture Slide 23

Efficiency• Because of friction,

– work output < work input– Efficiency < 100%– Efficiency can also be found by

WorkInput

WorkOutputEfficiency

Page 24: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Practice 1• Both the KE and PE of a block freely sliding

down a ramp are shown below only at the bottom position in the sketch. Fill in the missing values for the other positions

Energy Lecture Slide 24

Page 25: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Practice 2

Energy Lecture Slide 25

Page 26: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Practice 3

Energy Lecture Slide 26

Page 27: Energy Lecture Slide 1 Energy Conservation. Energy can be thought of as the capacity for doing work Energy may be transformed from one type of energy

Energy Practice 4

Energy Lecture Slide 27


Estimation of Transformed Reaction Gibbs Energy for - Skemman

Lesson 3- Energy Transformationsmskuksclass.weebly.com/uploads/1/9/7/1/19719395/lesson_3... · 2018. 9. 9. · Lesson 3: Energy Transformations Energy can be transformed from one

Be Ye Transformed!

Be ye Transformed Vol 2

Waste water transformed into heat energy

Chapter 5: Energy Energy Energy is present in a variety of forms: mechanical, chemical, electromagnetic, nuclear, mass, etc. Energy can be transformed

TRANSFORMOR BE TRANSFORMED

Don’t follow the #Trend; Be #Transformed

ENERGETICS Laws of Thermodynamics #1 – Energy can be transferred and transformed, but not created or destroyed. (Conservation of energy) #2 – Every

RT 21 Final Exam Review. Law of Conservation Memorize the definition energy cannot be created or destroyed: energy can only be transferred (transformed)

TNEP Energy Transformed Lecture 1.2

Conservation of Energy PHYSICAL SCIENCE. The Law of Conservation of Energy Energy cannot be created or destroyed; it may be transformed from one form

Cellular Energy. The First Law of Thermodynamics first law of thermodynamics – Energy can be transferred and transformed, but it cannot be created or

Forms of Energy A Grear-Bigi Note-taking Lesson Ohio Indicator PS: Energy can be transformed or transferred but is never lost. PS: Energy can be transferred

transformed!” “Energy cannot be created or destroyed, onlypaas.psd202.org/documents/shollan1/1542237033.pdf · Sound - energy that moves through a substance by compression waves

Information must be transformed into signals before it can be transformed across the communication media How this information is transformed depends

Energy is often transformed from one form to another. As the Law of Conservation of Energy states: “energy is neither created nor destroyed only transformed.”

Energy can be transformed from one form to another FREE ENERGY (available for work) vs. HEAT (not available for work)

The Law of Conservation of Energy states: Conservation of Energy Energy cannot be created or destroyed Energy can be transformed from one form to another

Take a Risk Be Transformed

Estimation of Transformed Reaction Gibbs Energy for … · 2018. 10. 15. · namic parameter; transformed reaction Gibbs energy. This thesis focuses on devel-opment of computational

Energy: All living things must obtain and use energy E Energy cannot be created nor destroyed Energy can be transformed

Spheres of the Earth...four spheres. •All of Earth’s energy comes from the sun. •Energy cannot be created nor destroyed; it can be transformed and recycled. •Energy can be

EQ: What is energy and how can it be transformed? Unit 3: Eighth Grade

EQ: WHAT IS ENERGY, AND HOW CAN IT BE TRANSFORMED? HTTPS:// ENERGY TRANSFORMATIONS

Lesson 3- Energy Transformations - Ms. Plank: Grade 7/8msplanksclass.weebly.com/.../39088561/lesson_3-_energy_transform… · Lesson 3: Energy Transformations Energy can be transformed

Mechanical Energy Total Mechanical Energy. Total Mechanical Energy (E T ): Energy can be transferred or transformed, never lost Law of Conservation of

The Law of Conservation of Energy Energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy

1. Energy Transformations Most forms of energy can be transformed into other forms. Energy transformation: a change from one form of energy to another

Chapter 3first law of thermodynamics: Energy cannot be created or destroyed. It can only be transformed from one form to another It can only be transformed from one form to another

Electric Energy Using Electric Energy Energy can be neither created nor destroyed,…but it can be transformed from one kind to another

Matter, Energy, and the Environment Unit Notesmrsevanspcscience.weebly.com/uploads/1/3/...energy...First Law of Thermodynamics: Energy can be transformed (changed from one form to

Uganda Renewable Energy Feed-in Tariff Guidelines...Renewable energy resources that are transformed into modern energy services such as electricity, which can be generated from solar

Some basic concepts of energy (A)Conservation of energy Energy cannot be created nor destroyed. It can be transformed from one form to another, but the

Photosynthesis. Energy cannot be created or destroyed, it can only be transformed All organisms need carbohydrates for energy conversion