Introduction to energy
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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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Presentation Transcript

What is 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
Energy is Found in Many Forms

  • 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 the joule
Units of Energy – the Joule

  • Units of energy

  • Kg * m2/s2

  • Abbreviated J


Solving for kinetic energy
Solving for Kinetic Energy

KE = ½ mv2

KE – kinetic energy (in J)

m – mass (in kg)

v – velocity (in m/s)


Example of solving for kinetic energy
Example of Solving for Kinetic Energy

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


Potential energy
Potential 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


Solving for potential energy
Solving for Potential Energy

GPE = mgh

GPE – gravitational potential energy (in J)

m – mass (in kg)

g – 9/8 m/s2

h – height (in m)


Example of solving for potential energy
Example of Solving for Potential Energy

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


Changing gpe
Changing GPE

  • 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?


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