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02-06-08 - Energy-Kinetic Energy
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02-06-08 - Energy-Kinetic Energy

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  • 1. Unit 8 (Chapter 10 & 11) Work, Energy and Power
  • 2. Work
    • “ Work” means many things in different situations.
    • When we talk about work in physics we are talking about applying a force over a certain distance.
    • For work to occur a force must produce motion in the direction of the force.
    • Work = Force x Distance
  • 3. Power
    • How fast work gets done is called power
    • Power is measured in a unit called watts
    • A powerful machine can do the same amount of work in less time than a less powerful machine
    • 1 watt = 1 joule/sec
    • Horsepower is the English unit for power.
    • 1 horsepower = 746 watts
    • Power = work
    • time
  • 4. Energy
    • Energy is defined as the ability to do work
      • 6 Types of energy
        • Kinetic Energy: associated with motion
        • Heat: associated with the speed of internal particles
        • Chemical: bonds atoms together
        • Electromagnetic: moving electric charges
        • Nuclear: in the atomic nucleus
        • Potential Energy: energy of position (energy at rest)
  • 5. Energy
    • The units of energy are joules
    • joules are also the same unit as work!
    • (How Confusing!)
    • You can think of energy as stored work – that is ready to be released!
    • Energy cannot be created or destroyed – only changed from one type of energy to another!
  • 6. Kinetic Energy
    • Energy with motion
    • Energy an object has because it’s in motion
    • All moving objects that have mass have kinetic energy
    • As mass increases, the KE increases
    • As speed increases, the KE increases
    • KE changes more with speed than with mass
    • KE = mass x speed 2
    • 2
    Kinetic Energy Kinetic energy (joules) KE = ½ m v 2 m - mass of the object in kg v - speed of the object in m/s KE - the kinetic energy in J
  • 7. Kinetic Energy depends on two things: mass and speed The amount of kinetic energy the cart has is equal to the amount of work you do to get the cart moving A cart at rest has NO Kinetic energy Applying a force can give the cart speed, and therefore kinetic energy. Applying a greater force increases the speed and therefore the kinetic energy Increasing the mass also increases kinetic energy because it takes even more force to push.
  • 8. Work-Energy Theorem the net work done on an object is equal to its change in kinetic energy