unit 5 lesson 1 what is energy?

Unit 5 Lesson 1 What Is Energy?

Copyright © Houghton Mifflin Harcourt Publishing Company


Florida Benchmarks


• SC.5.P.10.1 Investigate and describe some basic forms of energy, including light, heat, sound, electrical, chemical, and mechanical.

• SC.5.P.10.2 Investigate and explain that energy has the ability to cause motion or create change.


Energy All Around


• Energy is the ability to cause changes in matter.

• Energy can transform, or change, from one form into another.

• Energy is never used up. It just changes form.


The Ups and Downs of Energy


• Potential energy (PE) is the energy an object has because of its position or condition.

• Kinetic energy (KE) is the energy an object has because of its motion.

• PE is stored energy. KE is energy of motion.


The Ups and Downs of Energy


• Energy can be stored as chemical energy.

• Potential energy can be changed to kinetic energy.

• Kinetic energy can be changed to potential energy.


Loud, Soft, Hot, Cold


• Sound energy is a form of energy that is carried as waves in vibrating matter.

• Sound energy is a type of kinetic energy, because particles of matter are moving.

• Sound energy is the cause of all the sounds you hear.


Loud, Soft, Hot, Cold


• Thermal energy is the total kinetic energy of the particles that make up a substance.

• You can sense thermal energy as temperature.

• The more thermal energy an object has, the greater its temperature.


See a Sea of Energy


• Light energy is a form of energy that can travel through space.

• Light energy travels as waves.

• Some objects give off light. Other objects reflect light.


See a Sea of Energy


• Electrical energy is energy caused by the movement of electric charges.

• Electrical energy can change to other types of energy you can use.


Energy in Machines and Food


• Mechanical energy is the total energy of motion and position of an object.

• Mechanical energy = KE + PE

• Machines use mechanical energy to do work.


Energy in Machines and Food


• Food contains energy.

• Chemical energy is energy that is stored in matter and that can be released by a chemical reaction.

• When your body breaks down food, potential chemical energy is released, producing heat.


Spotlight on Energy


• Musicians and performers rely on different forms of energy to complete their shows.

• Potential, kinetic, chemical, light, heat, mechanical, and sound energies are used.

unit 5 lesson 1 what is energy?

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