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# Introduction to Energy - PowerPoint PPT Presentation

Introduction to Energy. What Is Energy?. Changes are constantly occurring in the world. Every change requires energy. Energy – ability to cause change. Energy is Found in Many Forms. Electromagnetic energy – energy in waves Mechanical – energy in physical movement Heat – thermal energy

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## PowerPoint Slideshow about 'Introduction to Energy' - hafwen

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Presentation Transcript

### Introduction to Energy

• Changes are constantly occurring in the world.

• Every change requires energy.

• Energy – ability to cause change

• Electromagnetic energy – energy in waves

• Mechanical – energy in physical movement

• Heat – thermal energy

• Nuclear – energy stored in the nucleus of an atom

• Kinetic – energy an object in motion has

• Potential – stored energy due to an object’s position

• Units of energy

• Kg * m2/s2

• Abbreviated J

KE = ½ mv2

KE – kinetic energy (in J)

m – mass (in kg)

v – velocity (in m/s)

• A jogger with a mass of 60 kg is moving at a speed of 3 m/s. What is the kinetic energy?

• Elastic potential energy – energy stored by something that can stretch or compress

• Chemical potential energy – energy stored in chemical bonds

• Gravitational potential energy – energy stored in objects due to their position above the Earth’s surface

GPE = mgh

GPE – gravitational potential energy (in J)

m – mass (in kg)

g – 9/8 m/s2

h – height (in m)

• What is the gravitational potential energy of a ceiling fan that has a mass of 7 kg and is 4 m above the ground?

• As an object begins to fall it has GPE and KE.

• As the object gets closer to the ground it has less GPE and more KE.

• Example – An 80 kg skydiver jumps from a 10 m platform. What is the GPE of the skydiver at the top of the platform? What is the GPE of skydiver after falling 5 m?