Equations Flashcards
What is the equation for work done?
Work done (W, joules) = force (F, neutons) x distance (s, metres)
What is the equation for gravitational potential energy?
Eg (energy, joules) = m (mass, kg) x g (gravitational field strength, N/kg) x h (height, Metres)
What is the gravitational field strength on Earth?
9.8 n/Kg
What is the equation for weight?
W ( weight, neutons) = m (mass, kg) x g (GFS, n/kg)
What is the equation for kinetic energy?
Ek ( kinetic energy, joules) = 1/2 x m (mass, kg) x V squared (speed, m/s)
The equation for elastic potential energy?
Ee (elastic potent energy, joules) = 1/2 x k (spring constant N/M, x e squared ( extention (m) )
What is a spring constant?
A measure of how easy it is to stretch the material.
What is the equation for efficiency?
Useful output x 100 (percentage)
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Total input
How do you calculate total energy input?
Add useful energy output and wasted energy output together
How do you calculate 2nd equation for power?
P (power, watts) = E/t (energy over time, joules and seconds)
What is the equation for specific heat capacity?
E triangle = mc triangle theta (energy, joules = mass, kg times specific heat capacity, j/kg times theta, change in temp degrees celcius)
E= mc theta
What is the 1st equation for power?
Power= current x voltage
Watts, amps, volts
How do you calculate charge?
Charge (Q) = current (amps) / time (seconds)
Q= I/T
How do you calculate the potential difference?
Voltage= current x resistance
V(potent diff) = IxR
How do you calculate density?
Density= mass/ volume
P(kg/m2) = M(kg)/V( m2)
