Chapter 6 - Work, Energy, Power Flashcards
The equation for kinetic energy
K. E. = 1/2 mv^2
The equation for gravitational potential energy
G. P. E. = mgh
Show E = 1/2 kx^2
Work done, E = average force x distance
= 1/2 Fx ; F = kx
= 1/2 (kx)x
= 1/2 kx^2
The equation for work done, W
Work done, W = Fs ; s = displacement
= mas
= m(v^2 - u^2) / 2
The equation for work done, E
Work done, E = Pt
Define potential energy
It is the stored energy available to do work
Define gravitational potential energy
It is the energy of a mass due to its position in a gravitational field
Distinguish between G. P. E. and electrical potential energy
G. P. E. is stored when mass is moved due to work done in gravitational field whilst electric potential energy is stored when charge is moved due to work done in electric field
Define work done
It is the product of force and the distance moved in the direction of the force
Define elastic potential energy
It is the energy stored due to stretching or compressing of an object
Explain strain energy (elastic potential energy)
It is the ability to do work as a result of a change of shape of an object
Define power
It is the rate of doing work OR It is the work done per unit time
What does the gradient and area under the graph represents for velocity-time graph
Gradient: acceleration
Area under the graph: distance / displacement
