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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
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
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
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



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.



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.


What is gravity answer on later slide

What is gravity?answeronlater slide


Gravitational potential energy
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
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
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 chemical1
Gravitational, Elastic, or Chemical?

A book on a shelf.


Gravitational elastic or chemical2
Gravitational, Elastic, or Chemical?

A stretched rubber band.


Which one has more kinetic energy
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 energy1
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

  • 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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