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
p = hρg
```
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
s = vt
```
s = distance
v = speed
t = time
s = m (meters)
v = m/s (meters per second)
t = s (seconds)
```
27
a = Δv/t
```
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
v^2– u^2 = 2as
```
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
F = ma
```
F = force
m = mass
a = acceleration
F = N (newtons)
m = kg (kilograms)
a = m/s2
(meters per second
squared)
```
30
p = mv
```
p = momentum
m = mass
v = velocity
p = kg m/s (kilograms metre per
second)
m = kg (kilograms)
v = m/s (meters per second)
```
31
F = m Δv / Δt
```
F = force
m = mass
v = velocity
t = time
F = N (newtons)
m = kg (kilograms)
v = m/s (meters per second)
t = s (seconds)
```
32
Period = 1 / Frequency
```
Period = s (seconds)
Frequency = Hz (hertz)
```
33
T = 1 / F
```
T = Period
f = frequency
T = s (seconds)
f = Hz (hertz)
```
34
v = fλ
```
v = velocity
f = frequency
λ = wavelength (lambda)
v = m/s (meters per second)
f = Hz (hertz)
λ = m (meters)
```
35
Magnification = ?
Magnification = image height / object height
Ratio, so has no units
36
F = BIl
```
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
VsIs = VpIp
```
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
```
