p1- conservation and dissipation of energy

Question 1

what are the 8 different energy stores?

Answer 1

1) kinetic
2) thermal
3) chemical
4) gravitational potential
5) elastic potential
6) magnetic
7) electrostatic
8) nuclear

Question 2

kinetic energy (j) =

Answer 2

0.5 x mass (kg) x speed x speed (m/s)

Question 3

change in gravitational potential energy (j) =

Answer 3

mass (kg) x gravitational field strength (n/kg) x change in height (m)

Question 4

what ways can energy be transferred?

Answer 4

1) mechanically (force)
2) electrically (charge)
3) heating
4) radiation

Question 5

efficiency=

Answer 5

useful energy used / total energy input