P1: ENERGY Flashcards
1
Q
What are the 8 energy stores?
A
-kinetic
-chemical
-gravitational
-elastic
-thermal
-vibrational
-electromagnetic
-nuclear
2
Q
What is the law of conservation of energy?
A
energy is never created or destroyed but it can be shifted from one store to another
3
Q
Gravitational potential energy (GPE)
A
GPE = mass (kg) x gravitational field strength (N/kg) x height (m) (Ep = mgh)
4
Q
Kinetic energy
A
kinetic energy (J) = 0.5 x mass (kg) x velocity^2 (m/s) (Ek = 0.5mv^2)
5
Q
Elastic potential energy (EPE)
A
EPE (J) = 0.5 x spring constant (N/m) x extension^2 (m) (Ee = 0.5ke^2)
6
Q
(%) Efficiency
A
(%) efficiency = useful output energy / total input energy (x 100)
7
Q
Work done
A
work done (J) = force (N) x distance (m) (W = fs)
