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5 Written questions

5 Matching questions

  1. if you are carrying a suitcase,are you doing work on the suitcase? why or why not?
  2. What is the formula to calculating work?
  3. what is a screw?
  4. does a machine reduce the amount of work that is being done? Explain.
  5. What is a pulley?
  1. a No, the same amount of work is done, whether you do it yourself, or use a machine.
  2. b W= F x D, the unit Joule
  3. c a inclined plane that is wrapped in a spiral, usually on a rod, but not always.
  4. d simple machine that is made of a wheel with a groove in it and a rope. it is usually used to life heavy objects.
  5. e No. you are doing work on it when you pick it up, b/c when you pick it up, the direction of the movement of the object is the same as the direction of the force you are putting on it.

5 Multiple choice questions

  1. it means that the machine multiplies the force you put into it twenty times. so, if the machine multiplies the force by 20, you would only have to put in a small amount of force to do a large amount of work.
  2. you are only doing work on the ball as long as you are directly putting a force on it, in other words, when you are touching it.
  3. is a measure of how much of a machines energy is wasted, overcoming friction. No machine is 100% efficient, becuase there are always surfaces rubbing together.
  4. P=W / T, the unit Watts
  5. the rate at which work is done.

5 True/False questions

  1. if you are pushing against a wall, are you doing work? explain.No. work is only done when the object moves. if the object doesnt move, no matter how much force you put on it, it isnt work.

          

  2. Whats a wheel and axle?a simple machine that is made of a circular object connected to a rod.

          

  3. What is a lever? list two other examples of a lever.a simple machine that has a fulcrum, or pivot point.

          

  4. What are compound machines?a device that helps make work easier by changing the size or direction of a force.

          

  5. ^ ^ Doing work?Yes

          

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