The terms force, work, power, and energy often mean the same thing in everyday use. Obtain examples from advertisements, print media, radio, and television that illustrate meanings for these terms that differ from those used in physics.
Answers
Force is everyday context is a bit strange word. It's often used as an adjective to do something in a powerful way. Well, in physics force doesn't have to be always powerful. Force is a push or a pull that accelerates an object into motion. Perhaps the most famous equation for the force is Newton's second law of motion, that is,
F
=
m
a
.
Next, is the work. When we talk about work, it's like a very tedious thing to do. In physics, work is a complicated subject. Suppose we have a waiter lifting a tray full of drinks. In a day to day conversation, its safe to say that the waiter is doing work. However in physics, by defining work as a the force multiplied to the displacement parallel into it, then the waiter really does no work at all. The same thing by performing a squat with some weights. Since there is no displacement done to the weight, there is also no work.
Power on the other hand is a closer definition. Power which is usually measured in horsepower and it was adopted by James Watt to compare the output of steam engines will real horses. Since in the late 18th century, industrial people doesn't have the ability to measure power for their engines, turbines and motors.
Finally, energy have also a close definition. We say that energy is the capacity to do work. In physics and especially in thermodynamics, we look at energy and work as something interchangeable. Hence, the summation of all the energies and work in a closed system is constant.
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