Work Power and Machines

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Presentation transcript:

Work Power and Machines Concepts of Physics

Work can be best defined as Doing manual labor Applying a force over a distance with no motion Applying a force over a distance with motion Exerting energy while applying a force

The units for work are Watts Calories Amps Joules Volts Calories per pound

Joules could be used to measure The work done lifting a bowling ball The potential energy of a bowling ball held in the air The kinetic energy of a rolling ball All of the above None of the above Both B and C

1 Joule is equal to 1 N∙m 1 N∙s 1 kg∙m2/s2 Both A and C Both B and C

A force of 20 N is applied to picking a 15 kg ball 2 m high A force of 20 N is applied to picking a 15 kg ball 2 m high. What is the work done? 600 Joules 40 Joules 40 Watts 600 Watts 600 Amps 40 Amps

The units for power are Watts Calories Amps Joules Volts Calories per pound

In science work has a specific meaning Definition for work: A quantity that measures the effects of force acting over a distance. In science work has a specific meaning Work is done only when force causes a change in MOTION

Work Equation Work = Force x Distance Example: A man lifts a ball 2 meters in the air while exerting a force of 190 N. What is the work done? Example 2: A man holds a massive barbell stationary 2.5 meters in the air while applying a huge force.

Measurements of Work Since work = Force x Distance than the SI units for work must be N∙m. This is also known as a Joule (J). 1 kg ∙ m2/s2 = 1N ∙ m = 1 J

Power Does running up the stairs require more work than walking up the stairs? NO! remember Work = Force x Distance, time is not involved. When we involve time we are talking about POWER

Power Power = Work/time Power is defined as the rate at which work is done, or how much work is done in a certain amount of time. Equation form: Power = Work/time

Power is measured in WATTS (W) 1 Watt is the amount of Power required to 1 J of in 1 sec.

Example 1 It takes 100 kiloJoules (kJ) of work to lift an elevator 18 m. If it takes 20 sec for this to happen what is the average power during the process? 18 m

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