Potential and Kinetic Energy
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Potential and Kinetic Potential and Kinetic Energy Energy
description
Potential and Kinetic Energy. What is Energy???. The ability of an object To do work. Kinetic Energy. Potential Energy. Elastic Potential Energy. Gravitation Potential Energy. Chemical Potential Energy. Two Main Types of Energy. All Energy. What is Potential Energy?. - PowerPoint PPT Presentation
Transcript of Potential and Kinetic Energy
Potential and Kinetic EnergyPotential and Kinetic Energy
What is Energy???What is Energy???
The ability of an object
To do work
Two Main Types of EnergyTwo Main Types of Energy
PotentialEnergy
KineticEnergy
All Energy
GravitationPotentialEnergy
ElasticPotentialEnergy
ChemicalPotentialEnergy
What is Potential Energy?What is Potential Energy?o Energy that is Energy that is
stored and waiting stored and waiting to be used laterto be used later
What is Gravitational Potential What is Gravitational Potential Energy?Energy?
o Potential energy Potential energy due to an objectdue to an object’’s s positionposition
o P.E. = mass xP.E. = mass x height x gravityheight x gravity
Don’t look down, Rover!
Good boy!
PE
HeightMass
Gravity
ARRGGGG!! NO TRIANGLE
Find the Potential energy of a 20 kg bag of dog food elevated 5 meters above the ground on a shelf.
Mass = 20 kg
Height = 5 m
PE = mx g x h
PE = 20 kg x 9.8 m/s2 x 5 m
PE = 980 J
Find the potential energy of a 65 kg climber on top of Mt. Everest ( 8800 m high).
Mass = 65 kg
Height = 8800 m
PE = mx g x h
PE = 65 kg x 9.8 m/s2 x 8800 m
PE = 5 605 600 J
What is Elastic Potential What is Elastic Potential Energy?Energy?
o Potential energy due compression Potential energy due compression or expansion of an elastic object.or expansion of an elastic object.
Notice the ball compressingand expanding
What is Chemical Potential What is Chemical Potential Energy?Energy?
o Potential energy Potential energy stored within the stored within the chemical bonds chemical bonds of an objectof an object
What is Kinetic Energy?What is Kinetic Energy?o Energy an object has Energy an object has
due to its motiondue to its motiono K.E. = .5(mass x K.E. = .5(mass x
speedspeed22))
Depends on …
Mass
and
Speed
KE = ½ mass x velocity2
KE = ½ M X V2
Mass = 44 kg
Speed = 31 m/s
KE = ½ M x V2
KE = .5 x 44 kg x (31 m/s)2
KE = 21 142 J
What is the kinetic energy of a 44kg cheetah running at 31 m/s?
KE = ½ mass x velocity2
KE = ½ M X V2
Mass = 400 kg
Speed = 5 m/s
KE = ½ M x V2
KE = 400 kg x (5 m/s)2
KE = 5 000 J
What is the kinetic energy of a 400kg elevator descending at a rate of 5 m/s?
