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5 Written Questions

5 Matching Questions

  1. ^ ---> Doing work?
  2. What is a pulley?
  3. ^ ^ Doing work?
  4. What is a lever? list two other examples of a lever.
  5. if you are carrying a suitcase,are you doing work on the suitcase? why or why not?
  1. a Yes
  2. b a simple machine that has a fulcrum, or pivot point.
  3. c simple machine that is made of a wheel with a groove in it and a rope. it is usually used to life heavy objects.
  4. d 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. e No

5 Multiple Choice Questions

  1. a simple machine with a straight, slanted surface.
  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. pushing a piece of heavy furniture up a ramp requires less input force, from you, than just lifting it up.
  4. 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.
  5. Machines can change the size of the input force necessry. Also, they can change the direction of the force, which is especially helpfulo when we are trying to life somthing.

5 True/False Questions

  1. What two things do we need to know to calculate work?we need to know the size of the force that was put on the object, and how far the object moved.

          

  2. What is "power", scientifically speaking?Yes

          

  3. ^ <--- Doing work?No

          

  4. what is a wedge?a inclined plane that is wrapped in a spiral, usually on a rod, but not always.

          

  5. does a machine reduce the amount of work that is being done? Explain.Machines can change the size of the input force necessry. Also, they can change the direction of the force, which is especially helpfulo when we are trying to life somthing.

          

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