Equations

Question 1

Density

Answer 1

Density = Mass/ voulume (P = m/v)

Question 2

Kinetic energy

Answer 2

Ek = 0.5 x mass x (speed)^2
Ek=J (Joules)
m=kg (kilograms)
v=m/s (meters per second)

Question 3

Elastic potential energy

Answer 3

Ee = 0.5 x spring constant x (extension)^2
Ee = J (joules)
K = N/m
e= m

Question 4

Gravitational energy

Answer 4

Ep = m x g (9.8) x h
Ep = J
m = kg
g = m/s
h = meters

Question 5

Change in thermal energy

Answer 5

Mass x specific heat capacity x temperature change
ΔE = mcΔΦ
ΔE = J (Joules)
𝑚 = kg
c=J/kg°C
ΔΦ = Change in temperature (°C)

Question 6

Power 1

Answer 6

P = E/T

P = Power (Watts, W)
E = Energy (Joules, J)
T = Time (Seconds, s)

Question 7

Power 2

Answer 7

P = W/T

P=W (Watts)
W=J (Joules)
T=s (Seconds)

Question 8

Efficiency energy

Answer 8

Useful output energy transfer / Total input energy transfer
E = J

Question 9

Efficiency power

Answer 9

useful power/ Total power input
Power = Watts

Question 9

Charge flow

Answer 9

Q = I x T

Q = Charge (Coulombs, C)
I = Current (Amperes, A)
T = Time (Seconds, s)

Question 10

Potential difference

Answer 10

V = I x R

V = Voltage (Volts, V)
I = Current (Amperes, A)
R = Resistance (Ohms, Ω)

Question 11

Power both equations

Answer 11

P = I x V
P = I^2 x R

P = Power (Watts, W)
V = Voltage (Volts, V)
I = Current (Amperes, A)
R = Resistance (Ohms,
Ω)

Question 12

Energy transferred 1

Answer 12

E = P x T

E=J (Joules)
P=W (Watts)
T=s (Seconds)

Question 13

Energy transferred 2

Answer 13

E = Q x V

E = Energy (Joules, J)
Q = Charge (Coulombs, C)
V = Voltage (Volts, V)

Question 14

ideal transformer power equation. amps and voltage

Answer 14

Vp x Ip =Vs x Is

Vp = Primary voltage
𝐼𝑝 = Primary current
𝑉𝑠 = Secondary voltage
𝐼𝑠 = Secondary current
​

Question 15

Latent heat equation

Answer 15

E = mL

E=J (Joules)
𝑚=kg(kilograms)
𝐿=J/kg (Joules per kilogram)

Question 16

Weight equation

Answer 16

W = M x G

W=N (Newtons)
m=kg (kilograms)
G=m/s^2
(gravitational field strength, meters per second squared)

Question 17

Work done equation

Answer 17

W = F x S
W=J (Joules)
F=N (Newtons)
s=m (meters)

Question 18

Hooke’s Law

Answer 18

F = k x e

F=N (Newtons)
k=N/m (Spring constant, Newtons per meter)
e=m (Extension, meters)

Question 19

Distance equation

Answer 19

s = v x t

s=m (Distance, meters)
v=m/s (Velocity, meters per second)
t=s (Time, seconds)

Question 20

Acceleration equation

Answer 20

a = Δv/t

Δv=m/s (Change in velocity, meters per second)
t=s (Time, seconds)
Acceleration=m/s^2
(meters per second squared)

Question 21

third equation of motion

Answer 21

v^2 - u^2 = 2 a s

v=m/s (Final velocity, meters per second)

u=m/s (Initial velocity, meters per second)

𝑎 = m/s^2(Acceleration, meters per second squared)

s=m (Distance, meters)

Question 22

Force

Answer 22

F = m x a

F=N (resultant Force, Newtons)
m=kg (Mass, kilograms)
𝑎 = m/s^2) Acceleration, meters per second squared)

Question 23

Momentum

Answer 23

P = m x v

P=kg⋅m/s (Momentum, kilograms meters per second)

m=kg (Mass, kilograms)

v=m/s (Velocity, meters per second)

Question 24

Period equation

Answer 24

T = 1/f T=s (Period, seconds) Hz f=Hz (Frequency, Hertz)

Question 25

Wave velocity equation (for waves)

Answer 25

v = F/λ v=m/s (Velocity, meters per second) F=N (Force, Newtons) λ=m (Wavelength, meters)

Question 26

Magnetic Force equation

Answer 26

F = B I L F=N (Force, Newtons) B=T (Magnetic field strength, Tesla) I=A (Current, Amperes) L=m (Length of conductor, meters)

Question 27

Final velocity

Answer 27

v^2 = u^2 + 2as A= acelleration s = distance

Question 28

What is the equation for average force (F) when given mass (m), change in velocity (Δv), and time (Δt)?

Answer 28

F = m x Δv / Δt F in newtons (N), m in kilograms (kg), Δv in meters/second (m/s), Δt in seconds (s).

Question 29

ideal transformer power equation. Number of turns and voltage

Answer 29

Vp / Vs = Np / Ns V = Potential difference N = number of turns on coil I = current

Question 30

Pressure in a liquid

Answer 30

P = hpg P - pressure h = height p = pressure g = gravity