equations deck

Question 1

average speed =

Answer 1

average speed = total distance ÷ total time

Question 2

force =

Answer 2

force = mass x acceleration

Question 3

acceleration =

Answer 3

acceleration = change in velocity ÷ time taken

Question 4

density =

Answer 4

density = mass ÷ volume

Question 5

work done =

Answer 5

work done = force x distance moved in direction of the force

Question 6

energy transferred and work done

Answer 6

energy transferred = work done

Question 7

kinetic energy =

Answer 7

kinetic energy = 1/2 x mass x speed2

Question 8

gravitational potential energy =

Answer 8

gravitational potential energy = mass x g x height

Question 9

weight W =

Answer 9

weight = mass x gravitational field strength

Question 10

pressure =

Answer 10

pressure = force ÷ area

p = F/A

Question 11

moment =

Answer 11

moment = force x perpendicular distance from pivot

Question 12

charge =

Answer 12

charge = current x time

Q = I x t

Question 13

voltage V =

Answer 13

voltage = current x resistance

Question 14

wave speed v =

Answer 14

wave speed = frequency x wavelength

Question 15

refractive index n =

Answer 15

n = sin i ÷ sin r

Question 16

refractive index and critical angle

Answer 16

n = 1 ÷ sin c

Question 17

efficiency =

Answer 17

efficiency = useful energy output ÷ total energy input