general

Question 1

2 reasons why scientific models are useful

Answer 1

1) allow complex, abstract ideas to be simplified

2) provides a generalisation to allow calculations

Question 2

distinguish between fundamental units and derived units

Answer 2

fundamental units are defined arbitrarily/as a standard

derived units can be expressed in terms of the fundamental units

Question 3

why can you never have a negative value of KE?

Answer 3

the V^2 in an equation cancels it out

Question 4

definition thermal energy

Answer 4

the (non-mechanical) transfer of energy between two different bodies as a result of a temperature difference between them;

Question 5

why does water boil at constant temp (3)

Answer 5

all the thermal energy is used to separate the molecules/break the bonds between molecules; and not to increase their (average) kinetic energy; average kinetic energy is a measure of the temperature (of the wate