simple machines
describe different simple machines
lever changes the amount of force, you must exert a greater force to make object move. Pulley a graved wheel with a rope that helps pull up things. Wheel and Axle two turning objects that are attached to eachother to make eachother turn. Inclined plane a ramp that reduces the force you need to put to lift something. Gears a rotating wheel that has teeth on it
what is work
when you exert a force of an object and move that object the same distance in the direction of the force
what is a gear how do they work
a gear is a rotating wheel that has teeth on it the teeth of one gear fits into the teeth of the other gears
what is pressure
the physical force exerted on an object
a mechincal system that raises heavy objects
3 classes of levers
class 1 the fulcrum between effort and load can be used for power or precision. Class 2 always exerts a greater force on the load than the effort force you exterted on the lever. Class 3 you must exert a greater force on the lever than the lever exerts on the load
why do machines make work easier
it increase the amount of force applied increasing the distance over which the force is applied
what is a gear train
a group of two or more gears with gear trains the teeth of one gear fits into the teeth of the other gear
what devices use the pressure princple
what devices use hydraulic systems
hydraulic lifts,hydraulic brakes, hydraulic jacks
it uses hydraulic systems beacause these systems raise heavy objects
how do simple machines make tasks easier
they minimize the work we have to perform to do things like the pulley helps lift things into the air
the amount of force put by a machine based on the force applied to it
difference between potential and kinetic energy
potential energy is the stored energy in any object or system
kinetic is the energy of an object or system particles in motion
what is pascals law
Pressure applied to an enclosed fluid is transmitted equally in all directions through out the fluid
what are pneumatic systems
pneumatic systems do not seal gas seal air which passes through the pneumatic system under high pressure and them escapes outside
different types of pulleys
pulley a graved wheel with a rope running along the grove
moveable pulley attached to something else often by a rope that goes around the pulley itself it is a rope fixed to the celling and then comes down
how can machines be adapted to suit specific needs
by changing the natural enviroment by human made machines into human needs
how is energy transformed in a machine
how is energy transferred in a machine
kinetic energy of steam converted to mechincal energy in the turbine
through movement of change through potential difference
what happens when a fluid is compressed
the viscosity that is the resistance of the fluid to flow, also increase as the density increases
what devices use pneumatic systems and how
dental drill, air pump, jack hammer, air brush
they are enclosing air at high pressure and when the air is released it release a lot of power
what is a wheel and axle how does it work
the wheel does not have to be round as long as two turning objects are attached to eachother at their centres and cause the other to turn
what is ergonomics
how do frictional forces affect the operation and effciency of a machine
what is waste energy
friction reduces effciency because when two surfaces slide past eachother friction resists their motion
when energy is produced but not used or when it is used ineffciently
what is a subsystem
A unit or device that is part of a larger system