potential and kinetic energy. what is energy? energy – the ability to do work – does not have...

Potential and Kinetic

Energy

What is Energy?• Energy – the ability to do work–does NOT have mass or take up space–Measured in the unit joules

• 2 categories of energy–Potential Energy–Kinetic Energy

Forms of EnergyPotential Energy Kinetic Energy

Chemicalstored energy in bonds

Thermalenergy of moving particles (heat)

Elasticstored energy due to tension

Mechanicalenergy found in objects in motion

Nuclearstored energy in the nucleus of an atom

Electricalmovement of electrons

Gravitationalstored energy due to position above

ground

Soundlongitudinal waves that are heard

EM Wavesall the waves in the EM spectrum move

• Energy can take different forms

Law of Conservation of Energy

• Law of Conservation of Energy – no new energy is created nor destroyed, it’s just transferred from one form to another

Potential Energy• Potential Energy – stored energy of

position; the energy of rest.–Has the “potential” to do something

Kinetic Energy• Kinetic Energy – energy of motion

Energy Transformation•When you lift the marble off

the ground it gets potential energy because of its height

Energy Transformation• As the marble moves down the

track, it loses potential energy, and is converted into kinetic energy

Energy Transformation• The marble slows down as it goes

uphill because kinetic energy is being changed back into potential energy

Energy Transformation

Animated Roller Coaster

Energy Conversion

Energy Conversion

Energy Conversion

What kind of energy transformations are occurring here?

Potential or Kinetic?

Moving car

Kinetic

Potential or Kinetic?

Tree branch

Potential

Potential or Kinetic?

Bent car fender

Potential

Potential or Kinetic?

Balloon filled with water

Potential

Potential or Kinetic?

Log of wood

Potential

Potential or Kinetic?

Balloon squirting around

Kinetic

Potential or Kinetic?

Person inside a moving car

Kinetic

Potential or Kinetic?

Both

Potential or Kinetic?

Both

Potential or Kinetic?

Both

Potential or Kinetic?

An airplane circling in preparation for landing

Kinetic

Potential or Kinetic?

A pile of coal that will be used for fuel

Kinetic

Potential or Kinetic?

An unlit firecracker

Potential

Potential or Kinetic?

Glucose stored in plants as a result of photosynthesis

Potential

Potential or Kinetic?

Burning log of wood

Kinetic

Potential or Kinetic?

A dam holding back a river’s water

Potential

Potential or Kinetic?

A marble rolling down the aisle

Kinetic

Potential or Kinetic?

A new car battery

Potential

Potential or Kinetic?

An ant crawling across a sandwich

Kinetic

Potential or Kinetic?

A tennis racket about to crash down on a ball

Potential

Potential or Kinetic?

Energy at rest

Potential

Potential or Kinetic?

A mousetrap set and ready to spring

Potential