Work & Power.

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Presentation transcript:

Work & Power

The object has to move some distance. Work For work to occur two things must happen: The object has to move some distance. The object has to move in the same direction as the applied force – only the force acting IN THE SAME DIRECTION as the object’s motion is performing work.

Calculating Work Formula: W = (F)(d) The amount of work done depends on BOTH the AMOUNT OF FORCE exerted and the DISTANCE THE OBJECT MOVES. The amount of work can be determined by multiplying FORCE times DISTANCE: Formula: W = (F)(d) W = work F = Force d = Distance

Calculating Work SI Unit of Work = Joule (N*m) When force = NEWTONS (N) When distance = METERS Joule (N*m) Named after James Prescott Joule an physicist from the mid 1800’s who studied work 1 Joule =1 Newton of force to move an object 1 meter Joule is abbreviated with as J

- What Is Work? The Meaning of Work Work is done on an object when the object moves in the same direction in which the force is exerted.

Power Work is UNAFFECTED BY TIME Power is the rate (time) at which work is done. how fast or slow work is done Power equals the amount of work done on an object in a unit of time. With more power you can do the same amount of work in less time.

Power = force x distance Calculating Power Formula to calculate power: Power = Work Time OR Power = force x distance

When work is measured in joules, and time in seconds: SI Units for power: Joule/second (J/sec) 1 Watt = Joule/Sec. (J/s) James Watt & His Steam Engine

Units of Power One watt is a small amount of power Power is more often expressed in KILOWATT Kilowatt = 1000 watts Horsepower: English Unit (not an SI unit) 1 HP = 746 Watts Corvette

Quick Summary: What is work? How can you calculate work? Question Answer Work is done when an object moves in the same direction in which the force is exerted. What is work? How can you calculate work? Work = Force X Distance Power is the rate at which work is done. P = work / time What is power?