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Bellringer. What biome has few trees and lots of grasses with a long dry season and a short wet season? What do we call the variable that we measure in an experiment? What phase of the moon does a lunar eclipse occur? What type of tide occurs during 1 st and 3 rd quarter moons?.

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bellringer
Bellringer
  • What biome has few trees and lots of grasses with a long dry season and a short wet season?
  • What do we call the variable that we measure in an experiment?
  • What phase of the moon does a lunar eclipse occur?
  • What type of tide occurs during 1st and 3rd quarter moons?
what is energy
What is Energy?
  • Energy is the ability to do work.
  • Work is done when a force causes an object to move in the direction of the force.
  • Everything that happens in the world uses energy!
  • Most of the time we can’t see energy, but it is

everywhere around us!

energy
Energy…
  • is NEVER created or destroyed!
  • can only be STORED or TRANSFERED.- Law of Conservation of Energy
how do energy and work help you play tennis
How do energy and work help you play tennis?
  • The tennis player in does work on her racket by exerting a force on it.
  • The racket does work on the ball, and the ball does work on the net.
  • When one object does work on another, energy is transferred from the first object to the second object.
  • This energy allows the second object to do work. So, work is a transfer of energy.
  • Like work, energy is expressed in units of joules (J).
how is all energy divided
How is all energy divided?

All Energy

Potential Energy

Kinetic

Energy

kinetic energy
Kinetic Energy
  • In tennis, energy is transferred from the racket to the ball. As it flies over the net, the ball has kinetic energy.
  • Kinetic energy is the energy of motion.
  • All moving objects have kinetic energy.
  • Like all forms of energy, kinetic energy can be used to do work. For example, kinetic energy allows a hammer to do work on a nail.
slide9

The faster the object moves, the more kinetic energy is produced.

  • The greater the mass and speed of an object, the more kinetic energy there will be.
answer
ANSWER

The semi- truck has more mass;

therefore, more kinetic energy!

bellringer1
Bellringer
  • What biome has trees with leaves that have a waxy coating and cool temperatures?
  • What organisms get their energy from the sun?
  • What phase of the moon comes after waxing crescent?
  • What eclipse occurs during a new moon?
potential energy
Potential Energy
  • Is the energy an object has because of its position.
  • Example:
    • The bow has energy because work has been done to change its shape.
potential energy is
Potential Energy is…
  • The energy stored in an object.
  • "Potential" simply means the energy has the ability to do something useful later on.
elastic potential energy
Elastic Potential Energy
  • Energy can be stored in bowstrings, springs, and rubber bands.
  • You change the shape of these objects by stretching them.
gravitational potential energy
Gravitational Potential Energy
  • When an object is lifted off the Earth’s surface.
  • You use a force that is against the force of gravity.
  • Books on a shelf have gravitational potential energy.
chemical potential energy
Chemical Potential Energy
  • Potential energy stored in chemical bonds.
  • Before you eat that sugary drink or food, it has the potential to give you energy.
  • Food and drinks have chemical potential energy due to their chemical composition.
chemical potential energy1
Chemical Potential Energy
  • Batteries, gasoline, matches, and fireworks also have chemical potential energy.
potential or kinetic
Potential or Kinetic?

An apple on a tree.

potential or kinetic1
Potential or Kinetic?

A rolling ball.

potential or kinetic2
Potential or Kinetic?

A stretched rubber band.

gravitational elastic or chemical2
Gravitational, Elastic, or Chemical?

A stretched rubber band.

changing an objects height can change its potential energy
Changing an objects’ height can change its potential energy.
  • If I want to drop an apple from the top of one of these three things, where will be the most potential energy?

A

C

B

which one has more kinetic energy
Which one has more Kinetic energy?

If Ms. Russell rolled a bowling ball and a soccer ball down the aisle at the same speed, which one would have more kinetic energy?

which one has more kinetic energy1
Which one has more Kinetic Energy?

A red tennis ball rolling slow or a blue tennis ball rolling fast?

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