Download What is a machine?

Do Now:
What is a machine?
In what ways do we
rely on machines?
Think of examples!
Lab Next Week!
Guided Notes Sheet
Project due Wednesday 4/20
What is a Simple Machine?

A simple machine
has few or no
moving parts.

Simple machines
make work easier
Bill Nye Video Clip
The 6 Simple Machines
Inclined Plane
Screw
Pulley
Lever
Wedge
Wheel and Axle
Definitions:
Energy= Ability to do work
Work= Force x Distance
Force= A push or a pull
Effort= An applied force
Output= Force produced
by the machine
Work input and output
 Work
input is the amount of work
done on a machine.
 Input force x input distance
 Work
output is the amount of work
done by a machine.
 Output force x output distance
W out = W in
Dout
F out x D out = F in x D in
3m
10N x 3m = 2N x 15m
10 N
Din 15 m
Fin
Mechanical Advantage



Mechanical Advantage
(MA) compares output
and effort (input)
Output
force
MA =
Effort (input) force
The greater the MA,
the less work you have
to do to achieve the
same force!
Inclined Planes

An inclined plane
is a flat surface
that is higher on
one end

Inclined planes
make the work of
moving things
easier
Inclined Plane
Brain pop clip
Inclined Plane

The Egyptians used simple machines to build the
pyramids. One method was to build a very long
ramp rising to the top of the pyramid very gently.
The blocks of stone were placed on large logs
(another type of simple machine - the wheel and
axle) and pushed to the top of the pyramid.
Ideal vs. Actual Mechanical
Advantage for an Inclined Plane
IMA = Length of incline ÷ Height of
incline
AMA = Output force ÷ Input force
*There are no
units for MA
Screw
(a type of Inclined Plane)
Wedges

Two inclined
planes joined
back to back.

Wedges are
used to split
things.

A slanted
surface that
moves.
A Lever
A
rigid object free
to pivot around
some fixed point
 Fulcrum
= the
pivot point
Brain Pop - Levers
Rube Goldberg
Complex “Girls”
Machine