IGCSE Equations

Question 1

What equation links the following quantities?

average speed, distance and time

Answer 1

speed = distance ÷ time

speed = ^distance⁄_time

Question 2

What equation links the following quantities?

force, mass and acceleration

Answer 2

force = mass x acceleration

Question 3

What equation links the following quantities?

acceleration, change in velocity and time taken

Answer 3

acceleration = change in velocity ÷ time taken

Question 4

What equation links the following quantities?

momentum, mass and velocity

Answer 4

momentum = mass x velocity

Question 5

What equation links the following quantities?

density, mass and volume

Answer 5

density = mass ÷ volume

Question 6

What equation links the following quantities?

work done, force and distance moved

Answer 6

work done = force x distance moved

Question 7

What equation links the following quantities?

energy transferred and work done

Answer 7

energy transferred = work done

Question 8

What equation links the following quantities?

kinetic energy, mass and speed

Answer 8

kinetic energy = 1/2 x mass x speed²

Question 9

What equation links the following quantities?

gravitational potential energy, mass, g and height

Answer 9

gravitational potential energy = mass x g x height

Question 10

What equation links the following quantities?

weight, mass and gravitational field strength

Answer 10

weight = mass x gravitational field strength

Question 11

What equation links the following quantities?

pressure, force and area

Answer 11

pressure = force ÷ area

Question 12

What equation links the following quantities?

moment, force and perpendicular distance from pivot

Answer 12

moment = force x perpendicular distance from pivot

Question 13

What equation links the following quantities?

charge, current and time

Answer 13

charge = current x time

Question 14

What equation links the following quantities?

voltage, current and resistance

Answer 14

voltage = current x resistance

Question 15

What equation links the following quantities?

wave speed, frequency and wave length

Answer 15

wave speed = frequency x wave length

Question 16

What equation links the following quantities?

primary voltage, secondary voltage, primary turns and secondary turns

Answer 16

primary voltage ÷ secondary voltage = primary turns ÷ secondary turns

Question 17

What equation links the following quantities?

refractive index, angle of incidence, angle or refraction

Answer 17

n = sin i ÷ sin r

Question 18

What equation links the following quantities?

refractive index and critical angle

Answer 18

n = 1 ÷ sin c

Question 19

What equation links the following quantities?

efficiency, useful energy output and total energy input

Answer 19

efficiency = useful energy output ÷ total energy input

Question 20

What equation links the following quantities?

pressure difference, height, density and g

Answer 20

pressure difference = height x density x g

Question 21

What equation links the following?

input current, input voltage, output current and output voltage

Answer 21

input current x input voltage = output current x output voltage

I_IV_I = I_OV_O