word equations

Question 1

kinetic energy

Answer 1

0.5 x mass x speed²

Question 2

gravitational potential energy

Answer 2

mass x gravitational field strength x height

Question 3

power in energy (topic 1)

Answer 3

work done/time taken

energy transferred/time taken

Question 4

efficiency

Answer 4

useful energy output

total energy imput

Question 5

elastic potential energy

Answer 5

0.5 x spring constant x extension²

Question 6

change in thermal energy

Answer 6

mass x specific heat capacity x temperature change

Question 7

charge flow

Answer 7

current x time

Question 8

potential difference

Answer 8

current x resistance

Question 9

total resistance

Answer 9

resistance 1 + resistance 2 …..

Question 10

power (currentresistance)

Answer 10

current x potential difference

current² x resistance

Question 11

energy transferred in electricity

Answer 11

power x time

charge flow x potential difference

Question 12

density

Answer 12

mass
————
volume

Question 13

wave speed

Answer 13

frequency x wavelength

Question 14

image magnification

Answer 14

image height
———————
object height

Question 15

weight

Answer 15

mass x gravitational field strength

Question 16

work done (topic 1)

Answer 16

force x distance

Question 17

force in spring

Answer 17

spring constant x extension

Question 18

moment of a force

Answer 18

force x distance

Question 19

pressure

Answer 19

force normal to a surface
—————————————
area of that surface

Question 20

distance travelled

Answer 20

speed x time

Question 21

acceleration

Answer 21

change in velocity
————————
time taken

Question 22

momentum

Answer 22

mass x velocity

Question 23

acceleration (long equation)

Answer 23

2acceleration x speed = final velocity² - initial velocity²