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Energy Powerpoint

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Energy Powerpoint

  1. 1. Energy<br />Energy-the ability to do work. <br />-Because work and energy are so closely related, they are expressed in the same units. JOULES (J)<br />When a given amount of work is done, the same amount of energy is involved.<br />
  2. 2. Kinetic energy is energy of motion:<br /> -All moving objects have kinetic energy.<br /> - Objects with kinetic energy can do work.<br />*When you are bowling, and you throw the ball down the lane, you are using kinetic energy.<br />By throwing the ball, you are transferring your kinetic energy to the ball. The bowling ball will then transfer energy to the pins. <br />Kinetic Energy <br />
  3. 3. Kinetic Energy depends…..<br />On speed and Mass!!!<br />An objects kinetic energy can be determined by the following equation:<br />Kinetic energy= mv²/2<br />REMEMBER!!! V is for SPEED!!!<br />
  4. 4. M=mass of object<br />V= objects speed<br />The faster something is moving, the more kinetic energy it has. <br />The more massive a moving object is, the more kinetic energy it has.<br />Speed has a greater effect on kinetic energy than mass does. <br />Previous slide continued<br />
  5. 5. Potential Energy is Energy of Position<br />Potential energy- is the energy that an object has because of its position or shape.<br />Ex- a stretched bow, or a rubber band. When you pull back on a bow, energy is present because work was done to change its shape. <br />
  6. 6. Gravitational Potential Energy<br />Depends on weight and height.<br />As you lift an object, you do work on the object by using a force that opposes gravitational force.<br />You then give that object gravitational potential energy. Ex- lifting up your book bag. <br />The amount of gravitational potential energy an object has depends on its weight and how far above Earth’s surface it is. <br />
  7. 7. Gravitational Potential Energy<br />Gravitational Potential Energy=weight x height<br />Since weight is expressed in Newton&apos;s, you would work out the problem as follows: <br /> N · M= (J)<br /> Newton&apos;s x Meters = Joules<br />
  8. 8. Mechanical Energy<br /> Mechanical Energy sums it all up.<br />Mechanical Energy- is the total energy of motion and position of an object. <br />Mechanical energy can be all potential energy, all kinetic energy or some of both.<br />Mechanical Energy= potential energy + kinetic energy<br />

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