Equations (general) Flashcards
(17 cards)
What is the equation for kinetic energy?
KE = 0.5 x m x v^2
KE - joules (J)
v - metres per second (m/s)
m - kilograms (kg)
What is the equation for gravitational potential energy?
-include units
GPE = m x gfs x h
GPE - joules (J)
m - kilograms (kg)
gfs - newtons/kg (N/kg)
h - metres (m)
What is the equation for elastic potential energy?
E = 0.5 x k x e^2
E - joules (J)
k - newtons per metre (N/m)
e - metres (m)
*k = spring constant
**e = extension
What are the 2 (interchangeable) equations for power?
P = E/t
P = w/t
P - watts (W)
E - joules (J)
t - seconds (s)
w - joules (J)
*w = work done
How do you calculate efficiency?
Useful energy output / total energy input
What is the equation for charge?
-include units
Q = It
Q - coulombs (C)
I - amps (A)
t - seconds (s)
What equation links energy transferred, charge and potential difference?
-include units
E = V x Q
E - joules (J)
V - volts (V)
Q - coulombs (C)
What is the equation for voltage?
-include units
V = IR
V - volts (V)
I - amps (A)
R - resistance (Ω)
What equation links power, current and potential difference?
-include units
P = IV
P - watts (W)
I - amps (A)
V - volts (V)
What equation links current, power and resistance?
- include units
P = I^2 x R
P - watts (W)
I - amps (A)
R - ohms (Ω)
What is the equation for density?
-include units
p = m/v
p - (kg/m^3)
m - kilograms (kg)
v - metres cubed (m^3)
What equation links energy, specific latent heat and mass?
Q = mL
Q - joules (J)
m - kilograms (kg)
L - (J/kg)
*Q = energy (for some reason??)
What equation links pressure, constant and volume?
-what law is this?
Constant = pressure x volume
-Boyle’s law
What is the equation for Boyle’s law? (not including constant)
V1 P1 = V2 P2
Where v1 and p1 is first pressure and volume, v2 and p2 is second pressure and volume
What is the equation for inverse square law?
1/d^2
What is the equation for pressure?
Force / area
What is the equation for boyle’s law?
-give units
Pressure x volume = constant
Pa m^3
