Formulas for Test Flashcards
Distance travelled = ?
Using speed
Average speed x time
D
S T
Average speed = ?
Distance / time
D
S T
Time taken = ?
Using speed
Distance travelled / average speed
D
S T
Acceleration = ?
Using velocity
Change in velocity / time taken
a = (v-u)
——
t
Acceleration = ?
Using force
Force / mass
F
M A
Force = ?
Using acceleration
Mass x acceleration
F
M A
Mass = ?
Using force
Force / acceleration
F
M A
Weight = ?
Mass x gravitational field strength
W
M G
Mass = ?
Using weight
Weight / gravitational field strength
W
M G
Gravitational field strength =?
Using weight
Weight / mass
W
M G
Momentum =?
using velocity
Mass x velocity
P
M V
Mass = ?
Using momentum
Momentum / velocity
P
M V
Velocity =?
Using momentum
Momentum / mass
P
M V
Change in gravitational potential energy = ?
Mass x gravitational field strength x change in vertical height
ΔGPE = m x g x Δh
Kinetic energy = ?
½ x mass x (speed squared)
½ x m x v²
Efficiency = ?
(Useful energy transferred by the device)
——————————————————
(Total energy supplied to the device)
all x 100% to give the answer as a percentage
Wave speed =?
Using wavelength
Frequency x wavelength
V
f λ
Frequency of waves =?
Wave speed / wavelength
V
f λ
Wavelength =?
Wave speed / frequency
V
f λ
Wave speed =?
Using distance
Distance / time
D
V t
Distance =?
Using wave speed
Wave speed x time
D
V t
Time =?
Using wave speed
Distance / wave speed
D
V t
Change in velocity =?
Acceleration x time taken
a = (v-u)
——
t
Time taken =?
Using acceleration
Change in velocity / acceleration
a = (v-u)
——
t
Work done =?
Using force
Force x distance
Work done
F D
Force =?
Using work done
Work done / distance
Work done
F D
Distance =?
Using work done
Work done / force
Work done
F D
Power =?
using work done
Work done / time taken
Work done
Power t
Work done =?
Using power
Power x time taken
Work done
Power t
Time taken =?
Using work done
Work done / power
Work done
Power t
Resistance =?
using voltage
Voltage / current
V
I R
Voltage =?
current x resistance
V
I R
Current =?
using voltage
Voltage / resistance
V
I R
What units must displacement always be in?
m
What units must velocity always be in?
m/s
What units must force always be in?
Newtons (N)
What units must acceleration always be in?
m/s²
What units must mass always be in?
Kg
What units must weight always be in?
Newtons (N)
What units must potential energy (PE) always be in?
Joules (J)
What units must work done always be in?
Joules (J)
What units must Kinetic Energy (KE) always be in?
Joules (J)
What units must Gravitational field strength always be in?
Newtons / Kilogram
N/Kg
What units must height always be in?
m
What units must power always be in?
Watts (W)
What units must momentum always be in?
Kilogram metres / seconds
Kgm/s
What units must frequency always be in?
Hertz (Hz)
What units must wavelength always be in?
m
What units must current always be in?
Amps (A)
What units must efficiency always be in?
It doesn’t have any units
or %
What units must potential difference always be in?
Voltage (V)
What units must resistance always be in?
Ohms (Ω)
What is the prefix “kilo” (K) in standard form?
x 10³
What is the prefix “mega” (M) in standard form?
x 10⁶
What is the prefix “giga” (G) in standard form?
x 10⁹
What is the prefix “pico” (p) in standard form?
E.g. Picometre
x 10⁻¹²
What is the prefix “nano” (n) in standard form?
E.g. Nanometre
x 10⁻⁹
What is the prefix “micro” (μ) in standard form?
E.g. Micrometre
x 10⁻⁶
What is the prefix “milli” (m) in standard form?
E.g. Millimetre
x 10⁻³
What units must temperature always be in?
°C
Energy transferred = ?
using charge moved
charge moved x potential difference
E
Q V
charge moved = ?
Energy transferred/ potential difference
E
Q V
Potential difference = ?
using energy transferred
Energy transferred / charge moved
E
Q V
charge = ?
current x time
Q
I T
Current = ?
using charge
charge / time
Q
I T
time =?
using charge
Charge / current
Q
I T
Potential difference=?
using resistance
Current x resistance
Current =?
using potential difference
potential difference / resistance
resistance =?
using potential difference
potential difference / current
power =?
using energy transferred
energy transferred / time taken
E
P T
energy transferred =?
using power
power x time taken
E
P T
time taken =?
using power
energy transferred / power
E
P T
electrical power =?
using resistance
current squared x resistance
P = I² x R
current =?
using electrical power and resistance
square root of (electrical power / resistance)
P = I² x R
resistance =?
using electrical power
electrical power / current squared
P = I² x R
Electrical power =?
using potential difference
current x potential difference
P
I V
current =?
using electrical power and potential difference
electrical power / potential difference
P
I V
potential difference =?
using electrical power
electrical power / current
P
I V
density = ?
mass / volume
m
ρ v
mass =?
using density
density x volume
m
ρ v
volume =?
using density
mass / density
m
ρ v
force =?
using momentum
change in momentum / time
Δp
F t
change in momentum =?
force x time
Δp
F t
time =?
using force
change in momentum / force
Δp
F t
Energy transferred =?
using current
current x potential difference x time
pressure =?
force normal to surface / area of surface
area of surface =?
force normal to surface / pressure
force normal to surface =?
pressure x area of surface
(final velocity)² - (initial velocity)² =?
2 x acceleration x distance
v² - u² = 2 x a x d