Power is related to how fast a job is done. Like all rate quantities, power is a time-based quantity. Power is defined as the rate at which work is done upon an object. If the force is up and the displacement is to the right, then the angle is 90 degrees. If the force is in the opposite direction as the displacement, then the angle is 180 degrees. If the force is in the same direction as the displacement, then the angle is 0 degrees. In solving work problems, one must always be aware of this definition - theta is the angle between the force and the displacement which it causes. The angle is not just any stated angle in the problem it is the angle between the F and the d vectors. The most complicated part of the work equation and work calculations is the meaning of the angle theta in the above equation. meter, defined as a Joule and abbreviated with a J.Since the standard metric unit of force is the Newton and the standard meteric unit of displacement is the meter, then the standard metric unit of work is a Newton Each of these three variables find their way into the equation for work. Three variables are of importance in this definition - force, displacement, and the extent to which the force causes or hinders the displacement. Work results when a force acts upon an object to cause a displacement (or a motion) or, in some instances, to hinder a motion. The more difficult problems are color-coded as blue problems. This set of 32 problems targets your ability to use equations related to work and power, to calculate the kinetic, potential and total mechanical energy, and to use the work-energy relationship in order to determine the final speed, stopping distance or final height of an object. Work, Energy and Power: Problem Set Overview Overview | Problem Set | Audio Guided Solutions
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