inclined planes 5w’s · 2014. 3. 18. · inclined planes are everywhere around us. on a piece of...
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Inclined
Planes – 5W’s Simple Machines
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What?
An inclined plane is a flat surface
that connects a lower level with a
higher level.
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What?
The word inclined means, “at an angle.”
The word plane means, “a flat surface.”
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Why?
What would happen if you built a skate
park with no ramps?
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Why?
When it comes to a skate board park, you
need to have ramps.
A skateboard ramp is a simple machine.
Inclined planes come in many forms such as
ramps, slides, stairs and winding roads.
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Up!
Stand up behind your desk and push your
chair in. Make sure you have space in front
of you.
Now, close your eyes.
Follow my directions. I’m not joking :)
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Your eyes should be closed
right now… you shouldn’t be
reading this.
Your favourite celebrity is in trouble. S/he is being held against their will by an evil mathematician. It is your responsibility to save her/him. Unfortunately, the mathematician is holding the celebrity at the top of a cliff.
The only trick is that there is no road, and no other way to get to the top except to go straight up.
Now, climb.
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Why?
A winding road or path would take longer but you would use less effort.
Remember the force of gravity? An inclined plane splits gravity into two smaller forces.
When you use an inclined plane like a winding road, you go forward and up. The distance you travel is greater but the force is less.
http://www.youtube.com/watch?v=igrMlzHL-qg
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Force
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What?
A force is any influence that causes an
object to undergo a change in either its:
Movement
Direction
Geometric construction (physical make-up)
Think of it as a push or pull on an object, caused
by an interaction with another object.
http://www.youtube.com/watch?v=LEs9J2IQIZY
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Back to
Inclined Planes!
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Who?
We all use inclined planes (whether we’re
aware or not).
Where do they exist in the real world?
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Who?
In ancient times, armies built inclined
places called siege ramps. These ramps
made it possible for armies to haul heavy
equipment to the tops of high walls. In 73
AD Roman soldiers built a huge siege
ramp using thousands of tons of dirt and
rock to attack the hilltop Jewish
settlement of Masada. The ramp still exists
today!
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When?
We use inclined planes most often to reduce the effort (force) needed to lower or raise an object.
Think of how hard it would be to move a refrigerator into a truck without a ramp!
How hard would it be to lift that refrigerator back out of the truck?
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Where?
Inclined planes are everywhere around us.
On a piece of paper, make a list of sports
that rely on inclined planes in order to be
played. Be ready to explain how inclined
planes come into play for each sport.
This can go in the “class notes” section of your
binder.
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Sports & Inclined Planes
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Fundamental
Questions
What is a force?
What are some
examples of
forces?
How can forces
change an
object’s
movement,
shape, or
position?
… soon to come!
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Homework: Design an amusement park ride that relies on an
inclined plane to function properly.
It must be:
1. Drawn on a piece of white, unlined paper.
2. Labelled using straight lines (just like your other scientific drawings).
3. Safe.
4. Fun!
Due Date: Thursday, March 20th
You’ll be creating a ride based on each simple machine before the end of the unit.
Keep it simple, so that you don’t use all of your best ideas on one ride! You’ll be putting these together to create one huge amusement park.
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Name of Ride Student Name
Date handed in
*specifically label any
inclined planes
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