Energy Flashcards
Energy
The capacity of a system to do work
KE
KE= an object moving
KE= 1/2mv^2
kgm^2/s^2
PE
PE= mgh
kgm^2/s^2
Elastic potential energy
U=1/2kx^2
k=spring constant (n/m)
What happens to the kinetic energy of an object when its velocity is tripled?
The KE increases by a factor of 9. This is because 3^2=9
What are examples of potential energy?
Chemical, Elastic, electric, gravitational
Conservation of energy
Sum of all initial energy = sum of all final energies
Non-conservative force
Any force that causes energy to be lost from a system to the environment
EX) friction and air resistance
Kinematics equation for conservation of energy
Vf^2= Vi^2 + 2a(change of)d
Work energy theorem
W=(change of)E
What increases an objects energy?
Work done on an object by its environment
What decreases an objects energy?
Work done by an environment by an object on its environment
