Simple
Machines:
A machine with few or no moving
parts. Simple machines make work easier.
Work = Force x Distance
Inclined Plane
- a slanting surface connecting a lower level to a
higher level
- alters the way in which work is done
- the amount of work is the same
Screw
-an inclinded plane wrapped around a cylinder
- able to move itself, or move an object or material
surrounding it
Wedge
- acts like a moving inclinded plane
Wheel and Axel
- the movement of the wheel is turned into a shorter
but more powerful movement at the axel
Lever
- a straight rod or board that pivots on a point
known as a fulcrum
- the fulcrum can be moved depending on the weight
of the object to be lifted
Pulley
-a wheel over which a rope, chain or belt pass
- allows the pulling force direction to be changed
Energy
and Motion
The law of Conservation of
Energy tells us that energy can neither be created nor destroyed.
Energy exists
in two forms. Potential and kinetic energy are the two forms of energy
that
this lesson explores. Potential energy is stored energy that is ready
for use
at any time given the proper conditions. Kinetic energy involves the
release of
potential energy and is moving.
Concepts
1.
Potential energy is stored for
later use.
2.
Kinetic energy is created by
movement and depends on
the weight and speed of the object creating it.
3.
A system is a group of
interrelated components
designed collectively to achieve a desired goal.
4.
Some systems are found in
nature and some are made by
humans.
5.
Systems thinking involves
understanding how a whole
is expressed in terms of its parts, and conversely, how the parts
relate to
each other and to the whole.
6.
Technological systems include
input, output, and at
times, feedback.
Motion: An
activity or movement
4 Types of
Motion:
Linear: Movement
in 1 direction in a straight line
Reciprocating: move alternately
backward and forward
Rotating: to turn around an axis or center point;
revolve
Oscillating: to swing back and forth (in an arc).
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