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Transcript of Physical Systems
made of only one or two parts
the mechanisms of most physical systems are made of one or more simple machines that work alone or together to make physical tasks easier to do
there are 6 simple machines: the inclined plane, the wedge, the screw, the lever, the wheel and axle, and the pulley
they can be combined into two groups -those that relate to the inclined plane (wedge and screw) and those related to the lever (the wheel and axle and pulley) the word plane means flat surface and the word inclined means tilted so an inclined plane is a tilted flat surface
examples include a ramp, and less obviously a staircase
wedges are modified inclined planes, they have been altered so that they can be moved back and forth for example a knife or an axe
a screw is an example of an inclined plane that has been cut into a central core
the Archimede's screw is used to move water and other liquids
old school video from my youth enjoy :) The Inclined Plane. Wedge, and Screw Levers rotary motion is part of many systems, either as an input or an output or both
the turning motion is often transferred to another part of the system through the use of wheels, pulleys, and gears
the wheel and axle is the most common type of wheel mechanism it changes a small input force into a greater output force
a gear is a modified wheel and axle
gears are toothed wheels that are used to speed up or slow down motion
pulleys are used to lift heavy loads or change the direction of force
pulley systems can be both fixed and moveable Wheels and Axles, Gears, and Pulleys 1. Which of the 6 simple machines relates most to your everyday life?
2. Describe the relationship between input force, output force, and
3. Which of the following simple machines do you feel has had the
greater impact on humans? the inclined plane, the lever, or the
wheel and axle? Explain your answer. a rigid bar that pivots at a point called the fulcrum
the load arm is the part of the bar between the fulcrum and the load (the thing you want to move)
the effort arm is the part of the bar between the fulcrum and where the effort is applied
designed so that the force is applied to one part of the lever and the direction is changed or redirected to move load
the input force is the force applied to the lever
the output force is the redirected push that the lever applies to the load
the load force is the force that the users input force has overcome http://www.youtube.com/watch?v=yngNoWnwomw http://www.youtube.com/watch?v=yngNoWnwomw http://www.youtube.com/watch?v=OuPyvTQBwfQ