P5 - Work energy and Power Flashcards
What is the equation for work done?
Force x distance in the direction of the force.
W = Fx.
What does it mean if it’s on a smooth plane?
No friction so no energy needed to overcome it, only as gravity.
What is the equation for work done involving equations?
W = xFcos0.
What are the different energy forms?
.Kinetic - motion with mass.
.GPE - Position in g. field.
.Chemical - in bonds.
.Elastic - Reversible shape change.
.Nuclear - nuclei of atoms.
.Radiant - EM waves.
.Sound - Mechanical waves due to movement.
.Internal - random.
What is energy?
The capacity to do work - scalar.
What must Sankey Diagrams be?
To scale.
What is the equation for kinetic energy?
Ek = 1/2mv^2.
What is KE directly proportional to?
.Mass.
.Velocity^2.
When the other is constant.
What is the gravitational potential energy equation?
Ep = mgh.
What is the equation for the velocity of a falling object?
v = sqrt 2gh.
What is the equation for power?
P = W/t or P = Fv.
What is power?
Rate of work done.
What is the equation for efficiency?
Useful output/total input *100%.
