05 Work, Energy, Power Flashcards
Definition of work done by a force
Work done by a force on a body is the product of the force and the displacement in the direction of the force.
When a force does work on a body, the change in energy of the body is ____.
When a force does work on a body, the change in energy of the body is positive.
When a force does work against a body, the change in energy of the body is ____.
When a force does work against a body, the change in energy of the body is negative.
Elastic potential energy formula
elastic Ep = 1/2 kx²
where k is the spring constant, and
x is the extension of the spring
System energy equation
total initial energy of system + net work done on system = total final energy of system
OR
net work done on system = change in total energy of system
Principle of Conservation of Energy
Energy can neither be created nor destroyed, but it can be transformed from one form to another
