Chapter 1

Question 1

What are the 7 stores of energy

Answer 1

Kinetic 
Thermal
Elastic potential 
Gravitational potential
Chemical 
Magnetic
Electrostatic

Question 2

What are the 4 energy transfers?

Answer 2

Mechanical working
Electrical working
Heating by particles
Hearing by radiation

Question 3

What is the symbol and word equation for work done?

Answer 3

Work done = force x distance
W = F x S
(J) = (N) x (S)

Question 4

What’s the symbol and word equation for elastic potential?

Answer 4

Energy = 1/2 spring constant x extension^2
Ee = 1/2 k x e^2
(J) = (N/m) x (m)

Question 5

What is the symbol and word equation for weight?

Answer 5

Weight = mass x gravitational field strength 
W = m x g
(N) = (kg) x (N/kg)

Question 6

What is the symbol and word equation for kinetic energy?

Answer 6

Energy (kinetic) = 1/2 mass x velocity^2
Ek = 1/2 m x v^2
(J) = (kg) x (m/s)

Question 7

What is the symbol and word equation for gravitational potential energy?

Answer 7

Energy (gravitational) = weight x height
Eg = mg x h
(J) = (kg)(N/kg) x (m)

Question 8

What is the word and symbol equation for power?

Answer 8

Power = energy / time 
P = E / T
(W) = (J) x (S)

Question 9

What is the word equation for efficiency?

Answer 9

Efficiency = useful output / total input

Question 10

What are the prefixes?

kJ MJ mJ

Answer 10

kJ= 1000 J
MJ= 1000 000 J
mJ= 0.001 J

Question 11

What is the principal of conservation of energy?

Answer 11

Energy cannot be created or destroyed

only transferred from one store to another