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5 Written questions

5 Matching questions

  1. example of a wheel and axle.
  2. what is mechanical efficiency?
  3. What is the formula for power?
  4. ---> ----> Doing work?
  5. what is a machine's mechanical advantage? if i say a machine has a mechanical advantage of 20, what does that mean?
  1. a 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.
  2. b turn a door knob (the wheel) the axle moves, to unfasten the door.
  3. c 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.
  4. d P=W / T, the unit Watts
  5. e Yes

5 Multiple choice questions

  1. a double inclined plane that moves.
  2. stays still, like the middle of a seesaw.
  3. a inclined plane that is wrapped in a spiral, usually on a rod, but not always.
  4. Yes
  5. a simple machine that is made of a circular object connected to a rod.

5 True/False questions

  1. if you are carrying a suitcase,are you doing work on the suitcase? why or why not?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. What is a lever? list two other examples of a lever.a simple machine that has a fulcrum, or pivot point.

          

  3. What is the scientific meaning of the word "work"?Work happens when a force causes an object to move in the same direction of that force.

          

  4. What is the formula to calculating work?W= F x D, the unit Joule

          

  5. What is "power", scientifically speaking?the rate at which work is done.

          

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