Simple Machines 1
Machines with many parts are called
Complex or compound machines
What are the basic simple machines?
Pulleys, levers, wedges, inclined planes, wheel and axle and screws
The work that a screw does.
Holds things together.
The work that a wedge does.
cut or separate
Work can only be done if....
the object moves
Machines with one part are called
simple machines
When are levers most often used
To lift and move loads
The longer a the surface of an inclined plane, the work will be _______.
easier
Pulleys make it possible to _______ and _________ loads.
raise
lower
How Joules can be calculated.
Newtons X distance.
Name a wedge that exists naturally.
teeth, nails, claws, etc.
A real life example of an inclined plane.
Examples: slide on playground; disabled person ramp; a ladder; a roller coaster, etc.
The definition of work.
When a force moves an object over a distance in the same direction.
To become smaller or less.
decrease
To make bigger or more.
Increase
This is the pivot point of a lever.
Fulcrum
In a second class lever, the ____ is at one end, the ____ is in the middle and the ____ is applied at the opposite end.
The fulcrum is at one end, the load is in the middle and the effort is applied at the opposite end.
A wheel and axle is related to this other simple machine.
lever
In a third class lever, the ____ is at one end, the ____ is at the opposite end and the ____ is applied between them.
The fulcrum is at one end, the load is at the opposite end and the effort is applied between them.
How you calculate Newtons.
kgs. x 9.8
The resistance that one surface or object encounters when moving over another.
Friction
A machine found in the human body.
Arm, foot, leg, etc.
Kerry carries 30N of books for 1km. How much work does she do?
Since the direction and the force are not in the same direction, this is not work.
A prediction made By scientists before conducting an experiment
hypothesis
All forms of energy can be classified into these 2 groups.
kinetic and potential energy