Work & Energy
May 8, 2013
Work is the transfer of energy to an object by the application of a force that causes the object to move in the direction of the force. Three examples of work would be a tractor pulling a float, a mother pushing a baby stroller, and a body builder lift a barbell over their head. Work is measured in joules and the formula for work is Work=Force*Distance. Power is a quantity that measures the rate at which work is done or energy is transformed. The power equation is power= work/time (p=w/t). Power is measured in watts. An example of power and work being done is when a rock climber climbs a rock at gradual pace the power is small. Machines and Mechanical advantage is the ability to do work. Mechanical advantage is a quantity that expresses how much a machine multiplies force or distance. The purpose of Machines and Mechanical advantage is to do more work for humans and make it easier. The formula of Mechanical advantage is mechanical advantage= output force/input force = input force / output force. An example of a mechanical advantage would be a handy man using a hammer on a nail. Simple Machines are six uncomplicated types of machines, which are the basis for all other forms of machines. The six simple machines are simple lever, pulley, wheel and axle, simple inclined plane, wedge, and screw. The Lever family is divided into 3 types and the first one is a hammer type and seesaw. The second type of lever in the lever family is the wheelbarrow type. The 3rd and final lever is your arm. Examples of this lever would be holding a briefcase. The inclined plane family is screws, wedges, and an inclined plane.
Compound Machines are machines made of more than one simple machine. Most of the complicated machines are made up of many simple machines and sometimes the output force of one machine is the input force on another machine. The best example of a compound machine is a bicycle...
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