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Mechanical Jeopardy!
Mechanical Jeopardy!
Mechanical Jeopardy!Work Mech
AdvantageWedge & Wheels
Plane & Pulley
Sharp & Flat
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20 20 20 20 20
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Define Work.
Work is exerting force on an object that causes it to
move some distance.
What is the Formula for Work?
Work = Force x Distance.
Explain why carrying your books to class is
NOT doing work.
The direction of the force on your books (upwards) is not the direction your books
move in.
Mr. Antonello asks you to help him lift a 23N bag of sand from
the gym 6m upstairs to the science room. How much work
must you do? Include units!
1. W = F x D2. W = 23N x 6m3. W = 138N.m or Joules
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Final Jeopardy
What is the purpose of a Machine?
Machines enable you to do work in a way that is
easier or more effective.
List the 6 Simple Machines
1. Inclined Plane
2. Wedge3. Screw
4. Lever5. Pulley6. Wheel &
Axel
What is the Formula for Mechanical Advantage?
Mechanical Advantage = Output ForceInput Force
Using the formula for Work, explain how a simple
machine like a ramp can make work easier.
W = F x DBy increasing the distance (D), you decrease the force (F) needed to do the same
amount of work (W).
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Final Jeopardy
Describe the shape of a wedge.
A wedge is thick at one end and thins to an edge at the other.
Identify this simple machine and its two parts.
This screwdriver is an example of a Wheel & Axel.
Wheel
Axel
What kind of simple machine is a Zipper? How does it work?
A Zipper is 3 wedges.
How does a Wheel & Axel make work easier?
The wheel is larger than the axel. When you turn the wheel, it
multiplies your force on the axel and increases distance.
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Final Jeopardy
What is the name of this simple machine? How is it
easier than using stairs?
An Inclined Plane. By requiring less Force per step
Describe a pulley.
A grooved wheel with a rope wrapped
around it.
What are 2 ways that you can change a ramp to increase its
mechanical advantage?
MA = Length of incline Height of incline
Increase ramp length or lower ramp height.
Describe how the pulley in this picture works.
What is its mechanical advantage?
Pulling down on one end causes the other to rise. The MA is 1, since it only changes the direction of force.
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Final Jeopardy
Name this simple machine and the two simple machines that combine to form it?
The Screw is a combination of a Wedge
and Inclined Plane.
What is the triangular rock in the above picture
called called?
A Fulcrum.
How can you increase the mechanical advantage of
a Screw?
Make the threads or tracks on the screw closer together.
How can you increase the output force of a lever?
Increase the distance of Input force from fulcrum.Decrease the distance of
Output force from fulcrum.
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Final Jeopardy
How does a soap dispenser
work?
603010
STOP
1. Pressing down ejects stored soap and injects air in, increasing pressure.
2. A spring lifts the pump back up, creating a vacuum from the pressure.
3. The pressure draws more soap into the tube for the next pump.
