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5 Written questions

5 Matching questions

  1. An example of an inclined plane.
  2. ---> ----> Doing work?
  3. what is mechanical efficiency?
  4. What is the formula to calculating work?
  5. if you are carrying a suitcase,are you doing work on the suitcase? why or why not?
  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 Yes
  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 pushing a piece of heavy furniture up a ramp requires less input force, from you, than just lifting it up.
  5. e W= F x D, the unit Joule

5 Multiple choice questions

  1. No
  2. No, the same amount of work is done, whether you do it yourself, or use a machine.
  3. a double inclined plane that moves.
  4. a simple machine that has a fulcrum, or pivot point.
  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. ^ ^ Doing work?Yes

          

  2. What is the formula for power?P=W / T, the unit Watts

          

  3. ^ <--- Doing work?No

          

  4. Whats a wheel and axle?turn a door knob (the wheel) the axle moves, to unfasten the door.

          

  5. What are compound machines?a machine made of two or more simple machines. example: scissors, can openers

          

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