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Please submit your answers to these questions as a text file(ascii)
to phy211@unl.edu before 8 a.m. Tuesday, Feb. 24, 1998.
Label the file as Bonus-06
- OBJECTIVES:
- Define the work done by a force and the work done on a particle.
- Calculate the work done by a constant or variable force oriented parallel
or obliquely to the displacement of the particle.
PREREQUISITES:
Calculating the dot (scalar) product of two vectors, given rectangular or polar
descriptions
Distinguishing between displacement and position, speed and velocity
Finding velocity or position, given position or velocity as a function of time
Constructing free-body diagrams
Applying Newton's second law of motion
Calculating definite integrals of polynomial functions
Finding the derivatives of polynomial and rational functions of one variable
Commentary
Energy is much in the news lately, The term "energy" usually refers to the
inherent ability of a material system, such as a person, a flashlight battery, or rocket
fuel, to bring about changes in its environment or in itself. Some common sources
of energy are the fuel used to heat hot water, the gasoline that propels a car,
thedammed water that drives the turbine in a hydroelectric plant, and the spinning
yo-yo that can climb up its own string. Inanimate energy sources are of central
importance in raising the standard of living of mankind above the subsistence
level.The physicist distinguishes among several types of energy, including kinetic
energy (associated with a flying arrow or other moving object), elastic energy
(associated with stretched or compressed springs), chemical energy (associated with
fuel-oxygen systems or a storage battery), thermal energy (associated with the sun
and other objects that are hotter than their surroundings), and nuclear energy.
Applications of the energy concept in the science of mechanics, which you are
studying now, usually concentrate on kinetic energy, potential energy (to be
introduced in the next lesson), and work (the transfer of energy by the action of a
force). Sometimes the phrase "mechanical energy" is used to refer to the forms of
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