P1 - Energy Stores and Transfers

Question 1

system meaning

Answer 1

object or group of objects

Question 2

closed system

Answer 2

one where no energy can escape to or enter from the surroundings.
p.s. the total energy in a closed system never changes

Question 3

chemical energy store meaning

Answer 3

energy that can be transferred by chemical reactions involving foods, fuels, and the chemical in batteries

Question 4

nuclear energy store meaning

Answer 4

energy stores in the nucleus of an atom

Question 5

magnetic energy store meaning

Answer 5

energy a magnetic object has when it is near a magnet or in a magnetic field

Question 6

electrostatic energy stores meaning

Answer 6

energy a charged object has when near another charged object

Question 7

four ways energy can be transferred

Answer 7

heating, waves, electricity and forces (mechanical work)

Question 8

gravitational potential energy (j) equation

Answer 8

mass x gravitational field strength (N/kg) x height (m)

Question 9

elastic potential energy (j) equation

Answer 9

0.5 x spring constant (N/m) x extension(squared)

Question 10

kinetic energy (j) equation

Answer 10

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

Question 11

efficiency equations

Answer 11

useful output energy transfer (j) / total input energy transfer (j) OR useful power output (w) / total power input (w)

Question 12

what is work done

Answer 12

energy transferred when a force moves an object

Question 13

ivr iqt veq pet ipv i2pr

Answer 13

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