energy

Question 1

state the law of conservation of energy:

Answer 1

the total energy is the same at all times.

Question 2

state the 7 energy stores:

Answer 2

magnetic, thermal , chemical , kinetic , electrostatic , elastic potential , gravitational potential , nuclear.

Question 3

state the 5 energy transfers:

Answer 3

heating , mechanical transfer , electrical transfer , transfer by radiation , other common transfers.

Question 4

state the equation for gravitational potential energy and say what each of the parts mean?

Answer 4

Eg= m x g x h
eg= gravitational potential energy 
m is mass 
g is acceleration due to gravity 
h is height

Question 5

state the equation for kinetic energy and say what each of the parts mean?

Answer 5

Ek= 1/2 x m x v2 (squared)
m is mass
v is speed

Question 6

what does each part of the elastic energy and equations mean?

Answer 6

Ee = 1/2 x k x e2 (squared)
Eg= elastic potential energy (J)
k is spring constant (N/m)
e is extension (m)

Question 7

what is specific heat capacity?

Answer 7

specific heat capacity is the energy it takes to raise the temperature of 1kg of a substance by 1.

Question 8

describe what each part of this equation means: (SHC equation.)

Answer 8

change of energy (J- joules)
m is mass
c is specific heat capacity
change of temperature (degrees Celsius)

Question 9

define the term power?

Answer 9

power is the amount of energy transferred or converted per unit time

Question 10

state the equation for power?

Answer 10

P	=	power
W	=	work

Question 11

define the term efficiency:

Answer 11

a measure of how much work or energy is conserved in a process