Study Guide for Exam 3
Momentum (and impulse)
know how to calculate the momentum of an object
definition of the impulse provided by a force
how it is related to the
change
in momentum of the thing that the force is applied to
impulse and momentum are vector quantities
impulsecan easily be expressed in terms of the
average
force over a time interval
collision
change in momentum of one or more objects
can relate (through the impulse) to the average force.
You should know what it means to say that the total momentum of an isolated system is
conserved.
“isolated” means that there is no net
external
force
recognize what systems this applies to
know how to use this principle to solve problems involving collisions or other
interactions between parts of a system
vector quantity
may need to work with x and y components.

did not cover angular momentum (section 9.7 in the textbook)
energy and work (the transfer of energy
)
know how to calculate the work done by a force on an object
when the force and displacement vectors are parallel, antiparallel, or at some other angle.
work can be positive, zero, or negative
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