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Transfer of Energy

By Jessica White

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Energy is the ability to do work.

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What

is Energy?

Energy can be in motion or at rest​.

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​Kinetic energy is what an object has when it is in motion.

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Potential energy is what an object has when it ​is at rest or not moving. It is stored energy waiting to be used. It is also an object that is in position to move.

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The rock has potential energy because it is not moving. It is pulled back in postition waiting to move.

Potential Energy

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The soccer ball has kinetic energy because it is in motion.

​​Kinetic Energy

• ​Chemical (potential)

• Heat (kinetic)

• Light ((kinetic)

• Sound (kinetic)

• Electrical​ (kinetic)

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Potential and Kinetic Energy Has Different Forms.

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Energy cannot be created or destroyed, it can only change form.

​For example: The boy holding the ball is an example of potential energy. When he drops the ball, it changes to kinetic energy.

-Transfer of energy-

The process of changing energy from one form to another.

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Multiple Choice

What energy does the swing have?

• Potential

• Kinetic

Multiple Choice

What energy does the swing have now?

• Potential

• Kinetic

Multiple Choice

The ability to do work is called _____.

• potential energy

• kinetic energy

• energy

• transfer of energy

Multiple Choice

True or False? Energy can be create and destroyed, but it cannot change form.

• True

• False

Multiple Choice

Transfer of Energy:

When you sit on a park swing that has been out in the sun, it feels warm. This is an example of _____.

• heat energy converting (changing) to electrical energy

• light energy converting (changing) to energy of motion.

• light energy converting (changing) to heat energy

• electrical energy converting (changing) to energy of motion

Multiple Choice

Transfer of Energy:

Dragging the bows across the strings of a violin converts (changes) energy of motion to _____

• electrical energy

• sound energy

• light energy

Conduction

• Conduction is when heat is transferred between two objects that are touching each other.

• Think about how WE are conductors of heat. When we touch someone's hand we might transfer some of our heat to them.

• You will see conduction in the real world when:

• Cooking by conduction: The burner on the stove will conduct heat energy to the bottom of a pan on top of it.

• OR The heat from the handle of the pan is transferred to your hand when you touch it.

Here is a picture of conduction in the kitchen.

Convection

• The transfer of thermal (heat) energy by the circulation (the arrows) or movement of a liquid or gas: convection currents Hot liquid/air rises then cools as it falls.

• Just like we talked about how inside of the Earth there are convection currents that move the hot and cold air.

• Anytime you see arrows going in a circular motion this is going to be convection.

Radiation

• When heat is transferred between two objects that are not touching, and can be far apart. Heat transfer by electromagnetic waves.

• Remember: this time the objects are not touching and can be very far apart.

• It is also invisible: So for an example if you are sitting next to a fire you can not see the transfer of heat but you can feel it.

• Things in the world that use radiation to heat are:

• The sun, microwaves, television, burners, bonfire, medical imaging, stereos, ovens, phones.

Multiple Choice

Land heats up during the day by absorbing energy from the sun. The land heats up the air and then the warm air begins to rise and is now currents of cooler air. What type of heat transfer is this? Hint: this is all a circle.

• Radiation

• Conduction

• Convection

Multiple Choice

If you are heating something on the stove and the metal handle becomes hot over time what type of energy transfer causes the handle to be hot.

• Convection

• Conduction

• Radiation

Multiple Choice

If you are holding a candle and it is lit you can feel the heat. The heat travel's to your hands by -

• Radiation

• Conduction

• Convection

Objective 2

• Patterns of thermal energy

• Remember: heat always moves from a warmer to a colder place.

Scenarios

• Objective 2 is about the patterns that thermal energy follow.

• Below are some scenarios, you need to tell what will happen.

Multiple Choice

What would happen if you left a metal spoon in a cup of hot tea?

• the heat from the tea would travel to the spoon until the spoon is the same temperature as the tea

• nothing will happen

• the cold from the metal spoon will travel to the hot tea.

Multiple Choice

Which is an example of thermal conduction?

• the water in the pot absorbs heat

• the pot gets hot from the contact of the stove

• you can feel the heat from the burner.

• water boils because of the currents.

Multiple Choice

Objects that allow heat to transfer easily are known as -

• conductors

• insulators

• radiators

• energy savors

Multiple Choice

If you don't add heat what will happen to an object?

• It will stay hot.

• It will become solid

• it will cool down to room temperature

• it will melt.

Multiple Choice

Heat always goes from -

• Higher to lower temperatures

• Lower to higher temperatures

• it doesn't go anywhere

Fill in the Blank

Energy can neither be created nor destroyed, it simply ______ forms

Multiple Choice

True or False: Every time you turn on the lights, you are creating energy

• True

• False