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Textbook: Homework: pg # 12 – 28 (even only)

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Presentation on theme: "Textbook: Homework: pg # 12 – 28 (even only)"— Presentation transcript:

1 Textbook: 7.1 - 7.3 Homework: pg. 241 - 242 # 12 – 28 (even only)
Energy, Work and Power Textbook: Homework: pg # 12 – 28 (even only)

2 Energy and Work Energy is the ability to do work
Ex. Kinetic, Thermal, Gravitational, Elastic, Chemical, Electric, Magnetic, Radiant… Work is the transfer of energy

3

4

5 James Prescott Joule (1818 – 1889):
English physicist Discovered relationship btw. heat & mechanical work (energy) Conservation of Energy Theorem

6

7 Pg 218

8 Power Power is the rate at which work is done [N.m] ,[J] Joule
Pg. 241 #23, 24, 28 [W] watt [s] second James Watt (1736 – 1819): Scottish inventor/mechanical engineer. Improved the efficiency of steam engines. Introduced horse power (750 watts).

9 If a hair dryer does 3000 J of work to heat the air every two seconds, what is its power?

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