Formulas

Question 1

Speed

Answer 1

=Distance/time or v=s/t

Question 2

Resultant force

Answer 2

=Mass x acceleration or F=ma

Question 3

Acceleration

Answer 3

=Change in velocity/time or a=(v-u)/t

Question 4

Density

Answer 4

=Mass/volume or ρ=m/V

Question 5

Work done

Answer 5

=Force x distance moved in direction of force or W=Fs

=Energy transfered

Question 6

Kinetic energy

Answer 6

=1/2 x mass x velocity^2 or KE=1/2mv^2

Question 7

Gravitational potential energy

Answer 7

=mass x g x height or GPE=mgh

Question 8

Weight

Answer 8

=mass x g or W=mg

Question 9

Pressure

Answer 9

=force/area or P=F/A

Question 10

Pressure difference

Answer 10

=density x gravity x height difference or 𝚫p= ρg 𝚫h

Question 11

Charge

Answer 11

=current x time Q=It

Question 12

Voltage

Answer 12

=current x resistance V=IR

Question 13

Electrical power

Answer 13

=voltage x current, P=VI

Question 14

Energy transferred

Answer 14

=charge x voltage, E=QV or
= current x voltage x time, E=IVt

Question 15

Wave speed

Answer 15

= frequency x wavelength, v=f λ

Question 16

frequency

Answer 16

=1/time period, f=1/t or
= wave speed/ wavelength, f=v/λ

Question 17

Efficiency

Answer 17

=(useful energy output/total energy input) x 100%

Question 18

Refractive index

Answer 18

=sin(incidence angle)/sin(refraction angle), n=sin(i)/sin(r)

Question 19

Power

Answer 19

=energy/time P=E/t (work done=energy transferred)

Question 20

Momentum

Answer 20

= mass x velocity
P=mv (Kgm/s)

Question 21

Final speed

Answer 21

(Final speed)^2=(initial speed)^2+(2 x acceleration x distance moved)
V^2=u^2+(2 x a x s)

Question 22

Equation linking pressure tempreture and constant of a gas

Answer 22

Pressure/temp=constant
p1/T1=p2/T2

Question 23

Equation linking pressure volume and constant of a gas

Answer 23

Pressure x volume = constant
p1 x V1 = p2 x V2