ENERGY What is it?. Where do you feel energy? Where do you see energy?

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Presentation transcript:

ENERGY What is it?

Where do you feel energy?

Where do you see energy?

Can energy be contained in things?

We usually observe energy when it is being transformed… Energy can change from one form into another form.

Hydro energy from a dam can be converted to electrical energy.

Plutonium fuel rods in a nuclear power plant have stored energy that can be transformed into thermal energy.

Solar energy can be transformed into stored chemical energy in an apple. You eat the apple and your body transforms that stored energy into heat and motion.

Energy from various forms can be harnessed and USED to do work. Quite simply, energy is something that allows us to do work!

What is work? Work is done when we lift a load against Earth’s gravity. To do work on a barbell, the barbell must be moved a distance. Work = force x distance W = Fd (Nm = joule)

Is this guy doing work???

Which of these athletes are doing work?

POWER What is the difference between a person that runs up a flight of stairs in 5 seconds versus 1 minute?

Power is a measure of how fast work is done. Using a liter of gas, a Ford Mustang produces 50 units of power for a half hour. Using a liter of gas, a Boeing 747 produces 90,000 units of power for one second.

What makes a car engine more powerful? Same amount of work, less time!!

Power = work time Unit = Joule second = Watt

What are the basic forms of energy? Kinetic energy = energy of motion Potential energy = stored energy KE = ½ mv 2 PE = mgh How does this equation relate to work? These 2 forms of energy make up what we call “MECHANICAL ENERGY”

1.At which points or points (1...5) in the pendulum's swing is its KE greatest? Why? 2.At which points or points (1...5) in the pendulum's swing is its PE greatest? 3.How does the pendulum’s total energy (KE + PE) change?? Assume no friction.

Which picture shows the most WORK being done to lift the 10 N ball 3 m?

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