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5 Written Questions

5 Matching Questions

  1. An example of an inclined plane.
  2. what is mechanical efficiency?
  3. What is "power", scientifically speaking?
  4. what is a wedge?
  5. What is a lever? list two other examples of a lever.
  1. a a simple machine that has a fulcrum, or pivot point.
  2. b pushing a piece of heavy furniture up a ramp requires less input force, from you, than just lifting it up.
  3. c 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. d a double inclined plane that moves.
  5. e the rate at which work is done.

5 Multiple Choice Questions

  1. we need to know the size of the force that was put on the object, and how far the object moved.
  2. stays still, like the middle of a seesaw.
  3. a machine made of two or more simple machines. example: scissors, can openers
  4. turn a door knob (the wheel) the axle moves, to unfasten the door.
  5. a device that helps make work easier by changing the size or direction of a force.

5 True/False Questions

  1. If machines do not reduce the amount of work being done, how do they help us?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.

          

  2. what is a machine's mechanical advantage? if i say a machine has a mechanical advantage of 20, what does that mean?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.

          

  3. if you throw a ball, 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.

          

  4. does a machine reduce the amount of work that is being done? Explain.No, the same amount of work is done, whether you do it yourself, or use a machine.

          

  5. What is an inclined plane?a simple machine with a straight, slanted surface.

          

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