Work_Machines-reviewgame

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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
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
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…

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

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!

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

Milking Cows!

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

April

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