Chapter 5: Work, Energy & Power Flashcards
1
Q
Define work done by a force on a body
A
The product of the force and the body’s displacement in the direction of the force
2
Q
What is the formula for gravitational potential energy?
A
E = mgh
3
Q
What is the formula for elastic potential energy?
A
E = ½kx²
4
Q
What is the formula for kinetic energy?
A
E = ½mv²
5
Q
State the principle of conservation of energy
A
Energy can neither be created or destroyed, but it can transformed from one form to another
6
Q
Define power
A
The rate at which work is done with respect to time
7
Q
Define efficiency of a device
A
The ratio of useful energy output to energy input, expressed as a percentage
