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					Work and Machines
     Review
Work   Levers   Inclined Power/      Your
                 Planes Efficiency Teachers

100     100      100       100       100

200     200      200       200      200


300     300      300       300       300


400     400      400       400       400


500     500      500       500       500
  Work for 100



What is the
formula for
   work?
  Formula for work…



    Work =
Force X Distance
      Work for 200

How much work is
 done if a a 50N force
 is applied on a stack
 of books to lift them
 2m off the floor?
 Amount of work done…

W=F X d
 = 50N X 2m
 = 100 J
      Work for 300…

How much force is
 applied on a box if a
 person does 500J of
 work on the box for a
 distance 50m?
   Force applied…

F= W / d
 = 500J / 50m
 = 10 N
        Work for 400

If you apply 20N of force
  upward on a flowerpot
  holding it up and walk a
  distance of 20m, how
  much work do your arms
  do on the flowerpot?
 The amount of work done…

None! The flowerpot
 is not moving in the
 direction in which you
 are applying the force
 with your arms.
       Work for 500
You apply a force of
 30N on a box you pick
 up off the floor and
 raise it up 5000mm off
 the floor. How much
 work did you do?
 The amount of work done…
Work = Force X
 Distance
      = 30N X 5m
      = 150J
Conversion:
        5000mm = 5m
     Levers for 100

What other two
simple machines
can be classified
as modified levers?
The two simple machines are…

     Pulleys
      and
   Wheel & Axle
      Levers for 200

What is the IMA of the
pulley system below?
    The IMA is…

Number of strings
    minus 1

     7-1 =6
        Levers for 300

Label the diagram below
 with, Fe, de, Fr, and dr.
 Identify the class.
    Labeled and Class…

Third Class
               dr   Fr
          de

Fulcrum
               Fe
      Levers for 400
What is the IMA of a
wheel and axle that
has a wheel with a
radius of 20cm and an
axle with a diameter of
10cm?
      The IMA is…
IMA = rw / ra
    = 20cm / 5cm
    =4

Conversion:
    10cm/2 = 5cm
     Levers for 500
Solve for the
resistance distance.
  The resistance force is…
   Win = Wout
   Fe x de = Fr xdr
 100N x 8m = 400N xdr
800Nm/400N = dr
         2m = dr
  Inclined Planes for 100
What other two
simple machines
can be classified
as modified
Inclined Planes?
The two simple Machines…

      Screw
       and
      Wedge
     Inclined Planes for 200
Which Screw has a
higher IMA?
 A
B
      More IMA…

“B” has the highest
 IMA, because the
 threads are closer
 together.
  Inclined Planes for 300

What is the IMA of a
knife with a length
of 8cm and a
thickness of 1cm?
     The IMA is…

IMA =
 length/thickness
    = 8cm / 1cm
    = 8
    Inclined Planes for 400

Label the diagram below
 with Fe, de, Fr, and dr.
     The labeled diagram…

                 de
dr               Fe
                            Fr
    Inclined Planes for 500
A ramp with a length of 5m
 and a height of 2m is
 used to a 600N rock on
 to a pickup truck. How
 much force will you have
 to exert on the rock to get
 it up the ramp (ideally)?
  The amount of force is…

Win = Wout
Fe x de = Fr x dr
Fe x 5m = 600N x 2m
Fe = 1200/5
   = 240N
 Power/Efficiency for 100

What is the
equation and
units for power?
   The equation is…

Power = Work
          Time
Units in Watts(W)
Power/Efficiency for 200

What is the
formula and
units for
efficiency?
     The formula is…

Efficiency= Workout x 100
            Workin


Units in percent (%)
 Power/Efficiency for 300

How do you
increase the
efficiency of a
machine?
You increase efficiency by…

  Adding oil or
   grease to
   decrease
   friction.
  Power/Efficiency for 400

How much work is
 done if 150W of
 power was used to
 move a 50N box in
 10s?
     Work done…

Power = Work / Time
Work = Power x Time
     = 150W x 10s
     = 1500J
   Power/Efficiency for 500
You apply 50N of force
 to a lever for a distance
 of 3m. In return the
 lever puts out 100J of
 work. What is the
 efficiency of the lever?
      The efficiency is…
Win = Fe x de
    = 50N x 3m
    = 150J
Efficiency = Work out x 100
             Work in
          =100J/150J x 100
          = 66.67%
   Your Teachers for 100

Is Mr. Sebastian
 Married? Is Mrs.
 DeRiemaker Married?
    Married???

Mr. S. Yes
Mrs. D. Yes
   Your Teachers 200

How many pets and
 types does Mrs. D
 have?
   Pets…


Two Cats
  Your Teachers for 300

What College does
Mr. S go to?
      College…


MSU!!!! Go STATE!
    Your Teachers 400

What does Mr. S do
to actually earn
money? Hint: It is
not working at
Eisenhower 
    Job…

Milking Cows!
   Your Teachers 500

What month is Mrs.
D’s baby due?
  Baby…



April

				
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