Science

Card Set Information

Author:
dominique
ID:
120684
Filename:
Science
Updated:
2011-12-05 19:43:39
Tags:
Test
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Description:
work and mechanical avantages
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  1. What is the equation for work?
    work=force*distance
  2. You pull a sled through snow

    work
    no work
    work
  3. A machine is a device that makes work EASIER by:


    • 1.amount of force exerted
    • 2.distance over which you exert the force
    • 3.the direction in which you exert it
  4. What is the SI unit for work?

    a.Newtons
    b.Pascal
    c.Joules
    Joules
  5. Mechanical Advantage:
    The number of time a machine multipies the input force.
  6. You hold a bag of groceries.

    work
    no work
    No work
  7. What formula is used to calculate power? Write the formula in TWO diffrent ways.
    • Power=work/time
    • Power=force*distance/time
  8. what direction MUST motion be in to do work?
    the SAME direction as the force
  9. Power:
    The rate at which work is done; the rate at which energy is consumed.
  10. You pull books out of ypur book bag

    work
    no work
    work
  11. you push a car stuck in the snow

    work
    no work
    no work
  12. you lift a bin of newspaper

    work
    no work
    work
  13. you hold a heavie piece of wood in place

    work
    no work
    no work
  14. Input Distance:
    distance through which the import force acts.
  15. Output Distance:
    Distance through which the output for acts.
  16. Pulley:
    a rope, chain or belt wrapped around a grooved wheel.
  17. types of pulleys:
    1.fixed
    2.movable
    3.block and tackle
    • 1. is attached to a struckture
    • 2. is attached to the object you are moving
    • 3. combines fixed and moveable pulleys

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