Work, Energy and Power Flashcards
1
Q
Define work done.
A
Work done by a force on a body is the product of the force and the displacement in the direction of the force.
2
Q
What is the Principle of Conservation of Energy?
A
It states that energy can neither be created nor destroyed, but it can be transformed from one form to another. The total amount of energy in an isolated system remains constant.
3
Q
Define energy efficiency.
A
The energy efficiency n of a device is the ratio of useful energy output to the energy input.
4
Q
Define Power.
A
Power is defined as the rate at which work is done.
5
Q
Tip (leave at green)
A
Work Done by friction is always negative, work done against friction is postitive.
