Physics Equations

Question 1

weight =

Answer 1

mass x gravitational field strength

Question 2

work done =

Answer 2

force x distance along the line of action of the force

Question 3

force applied to a spring =

Answer 3

spring constant x extension

Question 4

moment of a force =

Answer 4

force x distance normal to direction of force

Question 5

pressure =

Answer 5

force normal to a surface / area of that surface

Question 6

distance travelled =

Answer 6

speed x time

Question 7

acceleration =

Answer 7

change in velocity / time taken

Question 8

resultant force =

Answer 8

mass x acceleration

Question 9

momentum =

Answer 9

mass x velocity

Question 10

kinetic energy =

Answer 10

0.5 x mass x speed squared

Question 11

gravitational potential energy =

Answer 11

mass x gravitational field strength x height

Question 12

(1) power =

Answer 12

energy transferred / time

Question 13

(2) power =

Answer 13

work done / time

Question 14

(1) efficiency =

Answer 14

useful output energy transfer / total input energy transfer

Question 15

(2) efficiency =

Answer 15

useful power output / total power input

Question 16

wave speed =

Answer 16

frequency x wavelength

Question 17

charge flow =

Answer 17

current x time

Question 18

potential difference =

Answer 18

current x resistance

Question 19

(3) power =

Answer 19

potential difference x current

Question 20

(4) power =

Answer 20

current squared x resistance

Question 21

(1) energy transferred =

Answer 21

power x time

Question 22

(2) energy transferred =

Answer 22

charge flow x potential difference

Question 23

density =

Answer 23

mass / volume