Who Needs It?? Grade 6 Mrs. Figoten ENERGY: POTENTIAL

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ENERGY

• Who Needs It??

Grade 6 Mrs. Figoten
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ENERGY POTENTIAL KINETIC

• Potential energy
• Stored up energyor energy held in readiness

• Kinetic energy
• Energy of motion

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ENERGY The ability to do work cause change

• KINETIC ENERGY
• Energy of motion
• EXAMPLES
• moving bicycle
• moving auto
• high jumper jumping
• runner

• POTENTIAL ENERGY
• Stored-up energy, or
• energy held in readiness
• EXAMPLES
• Elastic Potential Energy
• Like slingshot or bungee cord
• Gravitational Potential Energy
• Like diver on diving board or light bulb in off
  position

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POTENTIAL ENERGY
Energy stored or held in readiness
Most potential
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THE TRADE OFF Between Potential Kinetic Energy

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KINETIC ENERGY
Energy of motion
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TYPES OF ENERGY

• MECHANICAL
• Car, plane, wagon
• THERMAL
• Heat from moving molecules
• Inside all matter furnace
• ELECTROMAGNETIC
• Visible light, microwaves, radio waves

• CHEMICAL
• Batteries, matches, body cells
• ELECTRICAL
• Lightning, power lines
• NUCLEAR
• Nuclear power plants, atomic bomb, sun stars

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FORCES MOTION

• FORCE
• A Push or a Pull
• MOTION
• A Change of Positionor Location

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FRICTION AS A FORCE

• Strength of friction depends on
• Types of surfaces involved
• How hard surfaces push
• together

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TYPES OF FRICTION

• SLIDING FRICTION
• 2 solid surfaces
• Strength depends on roughness of surfaces
• ROLLING FRICTION
• One solid rolls over the other
• Much easier to move object
• FLUID FRICTION
• Solid moving through a liquid or gas
• Less than sliding friction

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GRAVITY AS A FORCE

• FREE FALL
• Object accelerates as it falls due to gravity
• Object accelerates at rate of 9.8 m/s 2
• Every second velocity increases by 9.8 meters per
  second
• _at_ 2 seconds velocity is 9.8m/s 9.8m/s 19.6
  m/s
• _at_ 3 seconds velocity is 9.8m/s 9.8m/s 9.8m/s
  29.4 m/s

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GRAVITY AS A FORCE

• AIR RESISTANCE
• Type of fluid friction that opposes motion
• WEIGHT
• Measures force of gravity on object
• Weight Mass X Acceleration due to Gravity

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MOTION

• WHAT MAKES OBJECTS START MOVING . . .
  STOP MOVING . . . SLOW DOWN . . .
  SPEED UP . . . or CHANGE
  DIRECTION?

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NEWTONS FIRST LAW

• An object at rest remains at rest and an object
  in motion remains in motion unless acted upon by
  an outside force.

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NEWTONS SECOND LAW

• THE FORCE EXERTED BY AN OBJECT IS RELATED TO ITS
  MASS ITS ACCELERATION
• AN OBJECTS ACCELERATION IS RELATED TO ITS MASS
  THE FORCE REQUIRED TO MOVE IT
• FORCE MASS X ACCELERATION

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WHAT AFFECTS WHAT?
FORCE MASS X ACCELERATION

• FORCE ACCELERATION
  ACCELERATION FORCE
• MASS FORCE MASS
  ACCELERATION

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NEWTONS THIRD LAW

• For every action, there
• is an equal opposite reaction

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THE END