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5 Written Questions

4 Matching Questions

  1. if you are carrying a suitcase,are you doing work on the suitcase? why or why not?
  2. what is a wedge?
  3. ^ ^ Doing work?
  4. if you are pushing against a wall, are you doing work? explain.
  1. a 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.
  2. b a double inclined plane that moves.
  3. c Yes
  4. d 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.

5 Multiple Choice Questions

  1. 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.
  2. simple machine that is made of a wheel with a groove in it and a rope. it is usually used to life heavy objects.
  3. No
  4. a device that helps make work easier by changing the size or direction of a force.
  5. No, the same amount of work is done, whether you do it yourself, or use a machine.

5 True/False Questions

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

          

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

          

  3. what is mechanical efficiency?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. What is the formula to calculating work?W= F x D, the unit Joule

          

  5. what is a screw?a double inclined plane that moves.

          

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