Physics: Work, Power, Energy, and the Work-Energy Theorem
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12 Terms
What two things must be true for a person to do work?
A force must be applied and the force must change the state of objects.
When is no work done by a force?
No work will be done if the force is perpendicular to the direction of displacement.
What are the units of work?
Joules
What is power?
The rate at which work is done.
What are the units of power?
Watts
What are the units of energy?
Joules
What are the two forms of mechanical energy?
Potential and kinetic
What is the gravitational potential energy of an elevated object equal to?
The work done against gravity in lifting it.
What is potential energy?
Energy of position.
What is kinetic energy?
Energy of motion.
What does the work-energy theorem express?
Total work done on an object by all forces equals the change in kinetic energy.
True or false: If you push against a heavy refrigerator and it doesn't slide, then you are not doing work on the refrigerator.
True.