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Energy Energy It can come in many forms; electrical, chemical, thermal, nuclear, mechanical and electromagnetic. All energy can be classified as either __________ or ____________ measured in Joules (J) 1 Joule = 1 Nm

Potential Energy Potential energy exists whenever an object which has mass has a position within a force field (gravitational, magnetic, electrical). We will focus primarily on gravitational potential energy (energy an object has because of its height above the Earth)

Kinetic Energy Kinetic energy exists whenever an object which has mass is in motion with some velocity. Mathematically kinetic energy is:

Conservation of Energy Energy is another conserved quantity In the case of an object in free fall: When the object is at rest at some height h, then all of its energy is potential. As the object falls and accelerates due to the Earth’s gravity, potential is converted to kinetic. Velocity increases, KE increases; height decreases, PE decreases. At the instant before the object hits the ground, it’s h 0 so it’s PE is zero. All of it’s energy is kinetic.

Work Work is the In our previous case, the Earth was doing work on the falling object. Two things need to be considered when determining if work is being done

Work When you are lifting a book you are doing work on the book. When you are walking around with a book in your hands, you are not doing any work on the book. Mathematically: Work = Force * distance

Thanks Submitted by Adit DAV Public School Delhi

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