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Questions. What makes a light bulb light? What do some people have a lot of after eating or drinking something sugary? What do these two things have in common?. Energy. Is the ability to do work. Example: The tennis player does work on her racket by exerting force on it.

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Questions

  • What makes a light bulb light?

  • What do some people have a lot of after eating or drinking something sugary?

  • What do these two things have in common?


Energy

  • Is the ability to do work.

  • Example:

    • The tennis player does work on her racket by exerting force on it.

    • The racket does work on the ball.

    • The ball does work on the net


Kinetic Energy

  • Is the energy of motion.

  • Kinetic energy depends on mass and speed.

  • The faster something is moving, the more kinetic energy it has.

  • Also, the more mass a moving object has, the greater its kinetic energy.

WHAT IS MASS? answeronlater slide

WHAT IS WEIGHT? answeronlater slide


Think of and Share an Example of Kinetic 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.


Think of and Share an Example of 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.


What is gravity?answeronlater slide


Gravitational Potential Energy

  • When you lift an object, you do work on it.

  • You use a force that is against the force of gravity.

  • Books on a shelf have gravitational potential energy.


Chemical Potential Energy

  • 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.


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?

Our food and drink.


Gravitational, Elastic, or Chemical?

A book on a shelf.


Gravitational, Elastic, or Chemical?

A stretched rubber band.


Which one has more Kinetic energy?

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


Which one has more Kinetic Energy?

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


Mass

  • Mass – A measure of how much matter is in an object

  • Mass is not the same as size - some big things, like balloons, are very light, while some small things, like a gold brick, are very heavy. A truck would be the same size whether it was empty or full, but it would have a lot more mass if it was full - and it would be even harder to stop.

  • Mass is commonly measured by how much something weighs. But weight can change depending on where you are (such as on the moon) while the mass stays the same.


Weight

  • Weight – The downward force caused by gravity on an object.

  • Weightcan change depending on where you are (such as on the moon) while the mass stays the same.

  • Here are some conditions where the Weight might change:

    in space (can be weightless!)

    on the moon (a 100 kg mass would weigh 16.6 kg)

  • An object's mass doesn't change (unless you remove some), but its weight can change.


?

  • The force of attraction by which terrestrial bodies tend to fall toward the center of the earth.


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