2 What is Energy?The ability to make things move/cause change or to do workAny changeEvery change that occurs involves energy….changes REQUIRE energySI Unit – Joule ( J )
3 WorkThe transfer of energy from one object to another Work is when a force moves an object Also SI unit: Joule (J) Energy is the ability to do work. You are doing work. Your pencil is doing work. Both of you have energy.
4 Can you make things move? Then you have energy……but there are many different kinds of energy…
5 Curriculum Connection Everything we learn this year is connected in some way and we learn it in a logical order.Think back to our previous units:How is energy related to (or how does it build upon what we already learned about) motion and forces?
6 Review SlideWhat is the SI unit for each quantity? Write in your comp book – help each other if you need to.ForceHeightWorkMassEnergy
7 Chemical Energy What holds atoms in molecules together Has the “potential” to be released by chemical reactions like burning woodFOOD (CPE)
10 What is Chemical Energy? Energy that is available for release from chemical reactions.The chemical bonds in a matchstick store energy that is transformed into thermal energy when the match is struck.
15 What is Electrical Energy? Energy caused by the movement of electronsEasily transported through power lines and converted into other forms of energy
16 Thermal Energy (HEAT)The random motion, or vibration, of atoms in matterThe faster the atoms vibrate the more heat energy they haveHow we measure temperature
17 What is Thermal Energy?Heat energyThe heat energy of an object determines how active its atoms are.A hot object is one whose atoms and molecules are excited and show rapid movement.A cooler object's molecules and atoms will show less movement.
23 Mechanical Energy The total energy of moving things PE + KE = ME When you ride a bike you use mechanical energyAnytime you or an object does work.
24 What is Mechanical Energy? Energy due to a object’s motion (kinetic) or position (potential).The bowling ball has mechanical energy.When the ball strikes the pins, mechanical energy is transferred to the pins!
34 Energy Transformations When one form of energy changes to another form, this is called an energy transformation.Energy transformations occur most often between potential and kinetic energy.
35 Potential to KineticFalling objects- at the top of the hill, the ball has potential energy. As it rolls down the hill, its potential energy decreases, but as it gains speed its kinetic energy increases.
36 Energy can be transformed from one form to another Chemical energy in gasoline is changed to heat energy and then to mechanical energy in a car
37 Energy can be transformed from one form to another When you eat, your body converts the chemical energy in food into thermal energy.
38 QUIZ TIME!Electrical energy is transported to your house through power lines.When you plug an electric fan to a power outlet, electrical energy is transform into what type of energy?MECHANICAL ENERGY
39 QUIZ TIME!What energy transformation occurs when an electric lamp is turned on?ELECTRICAL ENERGYELECTROMAGNETIC/RADIANT ENERGY
40 What types of energy are shown below? Mechanical and Thermal Energy(Don’t forget friction)
41 What type of energy is shown below? Chemical Energy (CPE)
42 What types of energy are shown below? Electrical, Mechanical andElectromagnetic/Radiant Energy
43 What type of energy is shown below? Chemical Energy (yummy)
44 What type of energy is shown below? Thermal Energy
45 Energy Transfer Sound (mechanical) Electrical Thermal Mechanical ChemicalElectricalLight(Electromagnetic)
48 PowerThe rate energy is transformed. (Rate work is done) The more power something has, the quicker the energy transforms. Example) a runner running burns energy more quickly than someone walking, therefore they have more power Can you think of another example?
51 Kinetic energy: energy of a moving object because of its motion (Depends on MASS and SPEED)Potential energy: stored energy due to its position“Has the potential to move”
52 Kinetic = moving [falling apple] potential = stored (not moving)The apple has the ability to cause change…therefore, it has energyIf the apple stays in the tree, the energy is stored as potential energy, if it falls, there is a change of motion (kinetic energy)
53 TYPES OF POTENTIAL ENERGY Elastic Potential Energy - energy stored by something that can stretch or compress (like a rubber band or a spring)The stretching of the rubber band shows elastic pot. Energy – it flying through air is kineticGravitational Potential Energy (GPE) – the stored energy for anything that can fall (the energy stored by objects due to their position above the Earth’s surfaceDepends on the MASS & HEIGHT ABOVE GROUND
58 Law of Conservation of Energy As energy is transformed, it is neither created or destroyed. It stays the same. It is conserved. The amount of energy in the entire universe is always the same. It just transforms into different forms. (Friction can absorb some of the energy, but it doesn’t destroy it)
59 Which type of energy. How is this the Conservation of Energy Which type of energy? How is this the Conservation of Energy? Why does it eventually stop?
60 Both Potential and Kinetic. The friction eventually slows it down Both Potential and Kinetic. The friction eventually slows it down. Friction causes the energy to transform to thermal (heat) energy. Kinetic energy and potential combined make thermal energy.
61 RECAP:-The amount of energy in the Universe never changes. It just transforms (changes into different forms). The Law of Conservation of Energy. -There are two main types of energy: Kinetic (motion) and Potential (has the potential for motion) -There are many other forms of energy that can transform into each other. -The unit for energy is the joule and energy is simply the ability for something to change.