Bellringer

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# Bellringer - PowerPoint PPT Presentation

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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Presentation Transcript
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 are Kinetic and Potential 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…
• is NEVER created or destroyed!
• can only be STORED or TRANSFERED.- Law of Conservation of Energy
• 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?

All Energy

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

The semi- truck has more mass;

therefore, more kinetic energy!

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
• 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…
• The energy stored in an object.
• "Potential" simply means the energy has the ability to do something useful later on.
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
• 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
• 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 Energy
• Batteries, gasoline, matches, and fireworks also have chemical potential energy.

### Practicing with whiteboards

Potential or Kinetic?

An apple on a tree.

Potential or Kinetic?

A rolling ball.

Potential or Kinetic?

A stretched rubber band.

Gravitational, Elastic, or Chemical?

A stretched rubber band.

• 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?

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 Energy?

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