Part of Our Everyday Life Energy:. What is energy? The ability to do work.

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Presentation transcript:

Part of Our Everyday Life Energy:

What is energy? The ability to do work

All energy is either Potential: stored energyKinetic: energy in motion

Energy comes in many different forms Thermal (heat) Chemical Light Mechanical

Thermal (Heat) Energy Travels from higher (warm) to lower temperature (cool) Can move through matter Often produced when other energy forms go through a transformation Potential and kinetic energy of molecules Faster molecules, higher temperature Temperature is measure of how much thermal energy something has

Examples of heat energy Solar (sun) energy: sunlight strikes objects and warms them Stovetop: heat passes through material to heat what is in pan Insulation: blocks heat flow with layers of stuff; slows heat loss Refrigerator or air conditioner: motor runs cooling system; coolant gas flows through outside coils; evaporates into gas; pulling heat from inside to cause cooling

Electromagnetic (Light) Energy Travels in a path Travels in waves

Examples of light Energy Light bulb Fire Sun Flashlight Firefly (lightning bug)

Chemical Energy A chemical reaction occurs and chemical energy is released Stored energy

Examples of Chemical Energy Food Burning Batteries Matches

Mechanical Energy Energy an object has because of its motion or position

Examples of Mechanical Energy Stretched rubber bands Bow and arrow Hammer and nail

Questions and Discussions A potato A can of gasoline A log A gallon of milk How are these objects alike (related to energy)?

Cont. Do they have chemical energy? Potential energy? Light energy? Heat energy?

Cont. Name some examples of items where you can feel heat energy?

Cont. Sun Fire Candle

Cont. Each of the following best represents which form of energy? Leaf on an oak tree Wheel on a moving bicycle Batteries in a flashlight Burning campfire Food entering the stomach Turning on a battery-powered toy Sunlight coming to Earth

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