Energy

Law of conservation of energy

Energy can be changed from one form to another. total amount of energy in a system is constant. And it stays the same.

What are the different forms of Energy?

Energy can be present in different forms or in a combination

electrical energy

deals with movement of electrons from and area of high pe to low pe, current and voltage

law of conservation of mass

energy cannot be created or destroyed. can only be converted from one form to another.

Chemical Potential Energy

energy stored in the bands between atoms, energy stored in food, energy stored in batteries

What could be used to convert light energy to electrical energy

solar cell

Potential energy

stored energy

Gravitational Energy

stored energy due to the position of an object height above the ground weight lifting

Elastic Potential Energy

stored energy when a material is stretched or compressed rubberband

what is energy?

the ability or capacity to do work. Energy is never created.

PE can be converted to KE and then back again

when this happens, some of the energy is changed to heat/thermal energy due to friction. Energy transformations are not 100% efficient.

conservation of energy when a baseball is thrown from one player to another

1. a baseball player converts chemical energy from food to mechanical when she moves her arm to throw the ball 2. the work done on the ball converts the energy of the arm movement to kinetic mechanical energy of the ball 3. when the second player catches the ball, the ball does not on the players hand and the glove giving them some mechanical energy. the ball also moves the molecules in the glove heating them up 4. the player that catches the ball absorbs the energy of the ball and this energy turns to heat 5. the total heat produced is equal to the energy used to throw the ball

conservation of energy in a flashlight

1. battery has chemical potential energy 2. chemical energy changes due to electrical energy 3. electric energy flows through the lightbulb and turns electric energy to light and heat

Chemical Energy

a type of energy is associated with atoms,ions, and molecules and the chemical bond that these particles form. When a chemical reaction happens, energy changes to another form (batteries store energy, body stores energy from food, photosynthesis)

light energy

associated with electromagnetic wave, does NOT need a medium to travel through. Can be transmitted through space. Sun gives us energy (also source of nuclear energy known as nuclear fusion)

Sound energy

associated with longitudinal waves , sound needs a medium to travel, it will not be transferred through space

the stored energy in a battery could be described as

chemical

thermal energy

heat, associated with movement of particles. Friction can cause ke to be converted to thermal energy

Mechanical Energy

is due to the positions or the movement of something. It can be potential (stored energy), kinetic (energy of movement), or the sum of the two.

what kind of energy does a windmill use to work

mechanical