simple machines. the use of force to move an object over a distance
TRANSCRIPT
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Simple Machines
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the use of force to move an object over
a distance
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work
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For work to be done, an object has to
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move
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When using a simple machine, the
number of forces applied are
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1
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a bar that tilts or pivots on a fixed
point
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lever
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a fixed point on a lever
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fulcrum
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What decreases the force needed on a
lever?
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Moving the load closer to the fulcrum
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What kind of lever?
lever with the load between the force and the fulcrum
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Second Class
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lever with the fulcrum between the effort and load
What kind of lever?
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First Class Lever
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What kind of lever?
lever with the effort between the force and load
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Class 3
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a simple machine made of a wheel and a rod that turn
together
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Wheel and axle
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a rod between two wheels
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axle
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A big wheel makes the turning force easier, but it will require a
longer
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distance
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a surface
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plane
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a slanted surface
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Inclined plane
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What is easier? Lifting something straight up
Or Pushing up an inclined plane
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Inclined Plane
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Which is easier?
Steep slope
Flatter slope
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Flatter slope
easier
harder
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an inclined plane wrapped around a
post
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Screw
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Inclined plane requires a longer
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distance
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made of two inclined planed put back to
back
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wedge
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A wedge can be used to _____ and ______
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Cut and lift
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A pulley can change the _______ of a
force.
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direction
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Adding pulleys can _____________ the force needed
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reduce
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Which two simple machines are most
alike?
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screw and inclined plane
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Which simple machine would be
best to slice carrot?
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wedge
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Which of the following changes the direction of a force but not the amount of force needed to
do work?
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Single pulley
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How do we use a pulley everyday at
school?
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flagpole
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What is transferred when work is done?
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energy
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Which part of the lever supplies the
force to move something?
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effort
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Which part of the lever is the part you are trying to move?
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load
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What are the two types of forces?
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Push and Pull
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This is necessary to get something
moving
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force
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How many classes of levers are there
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3
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These two simple machines make a
screw
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Wheel and Axleand Inclined Plane
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If you use a screw driver to open a can
of paint, you are using it mostly as a
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lever
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If you weigh 80 pounds, and you are lifting an object with one pulley, the object has to
weigh how much?
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80 pounds or less