AQA PHYSICS Key Equations Flashcards
1
Q
Ek = ½ mv2
A
Ek = kinetic energy m = mass v = speed Ek = J (joules) m = kg (kilograms) v = m/s (meters per second)
2
Q
Ee = ½ ke2
A
Ee = elastic potential energy k = spring constant e = extension Ee = J (joules) k = N/m (newtons per meter) e = m (meters)
3
Q
Ep = mgh
A
Ep = gravitational potential energy m = mass g = gravitational field strength h = height Ep = J (joules) m = kg (kilograms) g = N/kg (newtons per kilogram) h = m (meters)
4
Q
ΔE = mcΔθ
A
ΔE = change in thermal energy m = mass c = specific heat capacity Δθ = temperature change ΔE = J (joules) m = kg (kilograms) c = J/kg˚C (joules per kilogram degree Celsius) Δθ = ˚C (degree Celsius)
5
Q
P = E/T
A
P = power E = energy transferred t = time P = W (watts) E = J (joules) t = s (seconds)
6
Q
P = W/T
A
P = power W = work done t = time P = W (watts) E = J (joules) t = s (seconds)
7
Q
Efficiency
A
Efficiency = useful energy out/ total energy in
8
Q
Efficiency
A
Efficiency = useful power out/total power in
9
Q
Q = It
A
Q = Charge I = Current t = Time Q = C (coulombs) I = A (amps) t = s (seconds)
10
Q
V = IR
A
V = Potential difference I = Current R = Resistance V = V (volts) I = A (amps) R = Ω (ohms)
11
Q
P = VI
A
P = Power V = Potential difference I = Current P = W (watts) V = V (volts) I = A (amps)
12
Q
P = I^2 R
A
P = Power I = Current R = Resistance P = W (watts) I = A (amps) R = Ω (ohms)
13
Q
E = Pt
A
E = Energy P = Power t = Time E = J (joules) P = W (watts) t = s (seconds)
14
Q
E = QV
A
E = Energy Q = Charge V = Potential difference E = J (joules) Q = C (coulombs) V = V (volts)
15
Q
ρ = m/V
A
ρ = density m = mass V = volume ρ = kg/m3 (kilograms per meter cubed m = kg (kilograms) V = m3 (meters cubed)
16
Q
ΔE = mcΔθ
A
ΔE = change in thermal energy m = mass c = specific heat capacity Δθ = temperature change ΔE = J (joules) m = kg (kilograms) c = J/kg˚C (joules per kilogram degree Celsius) Δθ = ˚C (degree Celsius)
17
Q
E = mL
A
E = Energy m = mass L = specific latent heat E = J (joules) m = kg (kilograms) L = J/kg (joules per kilogram)
18
Q
pV = constant
A
p = pressure V = volume p = Pa (pascals) V = m3 (meters cubed)
19
Q
W = mg
A
W = weight m = mass g = gravitational field strength W = N (newton’s) m = kg (kilograms) g = N/kg (newtons per kilogram)
20
Q
W = Fs
A
W = work done F = force s = distance W = J (joules) F = N (newtons) s = m (meters)
21
Q
F = ke
A
F = force k = spring constant e = extension F = N (newtons) k = N/m (newtons per meter) e = m (meters)
22
Q
Ee = ½ ke2
A
Ee = elastic potential energy k = spring constant e = extension Ee = J (joules) k = N/m (newtons per meter) e = m (meters)
23
Q
M = Fd
A
M = moment F = force d = distance M = Nm (newton-meters) F = N (newtons) d = m (meters)
24
Q
p = F/A
A
p = pressure F = force A = area p = Pa (pascals) F = N (newtons) A = m2 (meters squared)
25
Q
p = hρg
A
p = pressure h = height ρ = density g = gravitational field strength p = Pa (pascals) h = m (meters) ρ = kg/m3 (kilograms per meter cubed g = N/kg (newtons per kilogram)
26
Q
s = vt
A
s = distance v = speed t = time s = m (meters) v = m/s (meters per second) t = s (seconds)
27
Q
a = Δv/t
A
a = acceleration Δv = change in velocity t = time a = m/s2 (meters per second squared) Δv = m/s (meters per second) t = s (seconds)
28
Q
v^2– u^2 = 2as
A
v = final velocity u = initial velocity a = acceleration s = distance v = m/s (meters per second) u = m/s (meters per second) a = m/s2 (meters per second squared) s = m (meters)
29
Q
F = ma
A
F = force m = mass a = acceleration F = N (newtons) m = kg (kilograms) a = m/s2 (meters per second squared)
30
Q
p = mv
A
p = momentum m = mass v = velocity p = kg m/s (kilograms metre per second) m = kg (kilograms) v = m/s (meters per second)
31
Q
F = m Δv / Δt
A
F = force m = mass v = velocity t = time F = N (newtons) m = kg (kilograms) v = m/s (meters per second) t = s (seconds)
32
Q
Period = 1 / Frequency
A
Period = s (seconds) Frequency = Hz (hertz)
33
Q
T = 1 / F
A
T = Period f = frequency T = s (seconds) f = Hz (hertz)
34
Q
v = fλ
A
v = velocity f = frequency λ = wavelength (lambda) v = m/s (meters per second) f = Hz (hertz) λ = m (meters)
35
Q
Magnification = ?
A
Magnification = image height / object height
Ratio, so has no units
36
Q
F = BIl
A
F = force B = magnetic flux density I = Current (i) l = length (L) F = N (newtons) B = T (tesla) I = A (Amps or Amperes) l = m (meters)
37
Q
VsIs = VpIp
A
Vp = potential difference across the primary coil Vs = potential difference across the secondary coil np = number of turns on the primary coil ns = number of turns on the secondary coil Vp = V (volts) Vs = V (volts) np and ns have no units as they are just numbers
