equations (not on equation sheet)

Question 1

average speed

Answer 1

total distance(m) /total time(s)

speed: m/s

Question 2

average velocity

Answer 2

Δdisplacement(m) / time(s)

velocity: m/s

Question 3

acceleration

Answer 3

Δvelocity(m/s) / time(s)

acceleration: m/s^2

Question 4

the SUVAT equation that excludes u

Answer 4

s= vt - 1/2 at^2

Question 5

thinking distance

Answer 5

speed(m/s) * reaction time(s)

distance: m

Question 6

force when mass is constant

Answer 6

mass(kg) * acceleration(m/s^2)

Force: kg m/s^2

Question 7

weight

Answer 7

mass(kg) * 9.81

weight: N

Question 8

pressure in a fluid

Answer 8

depth(m) * 9.81 * density of fluid(kg/m^3)

pressure: Pa

Question 9

upthrust caused by fluid

Answer 9

9. 81 * density of fluid(kg/m^3) * height of object(m) * cross-sectional area of object (m^2)
   upthrust: N

Question 10

work done

Answer 10

force(N) * distance in the direction of the force(m)

work done: Nm or J

Question 11

kinetic energy

Answer 11

1/2 * mass(kg) * velocity^2(m/s)

KE: J

Question 12

Δgravitational potential energy

Answer 12

mass(kg) * Δheight(m) * 9.81

ΔGPE: J

Question 13

velocity assuming KE=GPE

Answer 13

Square root(29.81height(m))

velocity: m/s

Question 14

tensile stress

Answer 14

Force(N) / cross-sectional area(m^2)

stress: Pa

Question 15

tensile strain

Answer 15

extension(m) / original length(m)

*100 for a %

no units

Question 16

Young modulus

Answer 16

stress/strain

Young modulus: Pa

Question 17

impulse

Answer 17

force(N) * time(s)

impulse: Ns

Question 18

the equation for work done on an electron

Answer 18

electron charge * P.d(V) = 1/2 * mass(kg) * velocity^2(m/s)

work done: J

Question 19

the voltage across a component

Answer 19

current through the component(A) * components resistance(Ω)

voltage: V

Question 20

power of a component

Answer 20

P.d across component(V) * current through it(A)

power: W

Question 21

e.m.f

Answer 21

terminal P.d(V) + lost volts(V)

e.m.f: V

Question 22

an equation involving internal resistance

Answer 22

e.m.f(V) = current(A)Resistance of circuit(Ω) + current(A)internal resistance(Ω)

Question 23

intensity

Answer 23

Power(W) / area(m^2)

intensity: W/m^2

Question 24

refractive index

Answer 24

c (m/s) / speed of light in that material (m/s)

no units

Question 25

the equation describing what happens when light passes from one medium to the next

Answer 25

refractive index of medium 1 * Sin(angle of incidence) = refractive index of medium 2 * Sin(angle of refraction)

Question 26

equation of the critical angle between a material and air

Answer 26

Sin(critical angle) = 1/refractive index of material)

Question 27

wavelength from Young’s double-slit experiment

Answer 27

(slit separation(m) * fringe separation(m)) / distance between slits and screen(m)

wavelength (m)

Question 28

the energy of a photon

Answer 28

Planck constant * frequency(Hz)

energy: J

Question 29

an equation involving the threshold P.d

Answer 29

Electron charge * threshold voltage(V) = Planck constant * frequency(Hz)

Question 30

photoelectric effect equation

Answer 30

planck constant * frequency(Hz) = work function(J) + KE(max) (J)

Question 31

de Broglie equation

Answer 31

wave length of particle (m) = Planck constant / momentum (kg m/s)