Energy

1. Mechanical Energy◦ Energy associated with the motion or position of

an object◦ Either KE or PE◦ Ex. Running water, sound, wind, spring

2. Thermal Energy (Heat)◦ Total energy of the particles in a substance (KE)

Different forms of KE and PE

3. Chemical Energy◦ Potential energy stored in the chemical bonds

that hold compounds together◦ Ex. Food, fuels

4. Electrical Energy (KE)◦ Energy associated with moving electric charges◦ Ex. Lightning, batteries, power lines

Different Forms of Energy

5. Electromagnetic Energy (KE)◦ Energy that travels in waves◦ Ex. Light, x-rays, microwaves, UV light, infrared

radiation

6. Nuclear Energy (PE)◦ Energy stored in the nucleus of an atom and

released during a nuclear reaction

Different Forms of Energy

Energy cannot be created or destroyed Most forms of energy can be converted into

any other form

Law of Conservation of Energy

Temperature Average kinetic energy of all the particles in

a substance As the temperature rises describe what

happens to the particle movement and the KE.

Thermal Energy The total amount of energy of all the

particles in a substance is dependant on 3 factors:◦ Temperature◦ Number of particles◦ Arrangement of particles

Heat Heat transfers thermal energy from warmer

to cooler temperatures. Why does your chair feel warm after you get

up?

Heat transfer

3 ways heat can transfer

Practice: Conduction, Convection or Radiation?

1. Warm water is at the surface of the lake. 2. A metal spoon is hot to the touch when

left in a bowl of boiling water. 3. A fireplace warms up the house. 4. A plastic container melts inside a car on a

hot summer day. 5. A towel from the dryer warms your skin

on a cool day. 6. Lower floors of a building are cooler than

upper floors.

Answers 1. Convection 2. Conduction 3. Radiation 4. Radiation 5. Conduction 6. Convection