Science

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Anonymous
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214838
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Science
Updated:
2013-04-21 14:05:16
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Science
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Science
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  1. When is work done?
    when a force causes a change in motion of an object
  2. What is work
    is a force that is applied to an object mutiplied by the distance of movement of the object
  3. If we apply a force on an object that does not move. Is there any work being done
    no work has been done
  4. Sitting and looking at a computer screen is this work
    no
  5. Tapping on the keyboard and making the keys move is this work
    yes, because your fingers are moving and applying a force in the direction of motion (down)
  6. What units are work and energy expressed in ?
    joules
  7. What is power?
    Power is the quantity that measures the rate at which work is being done. How fast work is being done
  8. One watt is the amount of power required to do 1 _______ in 1 _______
    joule of work in 1 second of time
  9. What is energy (4)
    • the ability to do work
    • a measure of how much work is done
    • a word to describe the power and effort of a force
    • measured in joules
  10. What are the two main types of energy
    Kinetic energy and Potential energy
  11. What is potential energy ?
    is stored energy
  12. Coaster has PE when it is at the ____ of the hill. EVen if it isn't moving yet, it may if a force is applied and it begins to move
    Top
  13. What is gravitational potential energy (GPE) 
    is the energy of an object due to its position above the surface
  14. What is kinetic energy?
    is the energy due to an object's motion and is active energy
  15. A rock as it falls off of a cliff. Potential energy or Kinetic energy
  16. kinetic
  17. What is the Law of Conservation of Energy
    The Law of Conservation of Energy says energy cannot be created or destroyed, but it can be transformed from one form to another.
  18. What is the law of conservation of energy similar to ?
    law of conservation of mass/matter
  19. What are the forms of energy
    • Mechanical : motion- Potential and Kinetic, includes sound
    • Heat: friction
    • Electromagnetic: light and electricity
    • Chemical: food
    • Nuclear: fusion
  20. This is described as work divided by the time it takes to perform that work .
    power
  21. This is also known as kgm/sec2. It is the unit used to measure force
    newton
  22. This is the energy of motion
    kinectic
  23. This is one of the major reasons that machines never can reach a 100% effiency rating
    friction
  24. This is the unit used to designate work done.
    jouel
  25. this is the advantage of a high-horsepower automobile over a lower-horsepower automobile
    acceleration
  26. This is the ability to do work
    energy
  27. James Watt compared his steam engine to these when he was trying to market the new engine
    horses
  28. To determind the potential energy of an object, you must know the acceleration due to gravity, mass, and the ____
    height
  29. To compute a kinetic energy, you need mass and _____.
    velocity
  30. These are devices for mutiplying force or changing
    machines
  31. this is determined by mutiplying the force times the distace in which an object is moved
    work
  32. mass is caculated in units of _______________ when determining potential energy
    kilograms
  33. This is equal to the intial velocity okus acceleration mutiplied by time
    final velocity
  34. In an energy tranfer, the same type of energy moves to a __________ object.
    different
  35. Type of potential energy of objects at a height
    gravitational
  36. Energy of appliances such as stereos and computers
    electrical
  37. In an energy transformation, the object remains the __ but the energy changes to a different type
    same
  38. Type of potential energy of springs and rubber bands
    elastic
  39. Form of energy produced by musical instuments
    sound
  40. Ability to do work
    energy
  41. Law of ______________ of Energy states that energy cannot be created nor destroyed in a chemical reaction. It can be changed from one form to another
    Conservation
  42. Type of energy that is stored
    potential
  43. unit of energy
    joule
  44. Energy of radiant objects such as fire
    light
  45. Form of potential energy in food and dynamite.
    chemical
  46. In a light bulb, electrical energy changes to light energy. This is an example of an energy _____________-.
    transformation
  47. Form of energy of nuclear reactions
    nuclear
  48. Thermal energy
    heat
  49. When cooking on a stove, the heat energy moves from the stove to the saucepan to the cooking food. This is an exmaple of an energy ________
  50. transfer

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