Work and Power Flashcards
Whats the equation for work done?
WD = f x d
WD = Work Done (J)
f = Force (N)
d = Distance moved in the direction of force (m)
Whats the equation for Gravitational Potential Energy
GPE = mgh
GPE = Gravitational Potential Energy (J)
m = Mass (kg)
g = GFS (N/kg) - 9.8 on earth
h = Height (m)
Whats the equation for Kinetic Energy?
KE = 1/2mv^2
KE = Kinetic Energy
m = Mass (kg)
v = velocity (m/s)
What is power?
Power is the rate of energy transfer
What is the equation for Power (using power, time taken and work done)?
P = WD / t
P = Power (J)
WD = Work Done (J)
t = Time taken (s)
Link between GPE and KE
Unit of mass
Kilogram (Kg)
Unit of energy
Joule (J)
Unit of length
Metre (m)
Unit of velocity/speed
Metre/ second (m/s)
Unit of acceleration
Metre/ second^2(m/s^2)
Unit of force
Newton (N)
Unit of time
Second (s)
Unit of electrical power
Watt (W)
Is energy required to keep satellites in orbit?
No because it’s at a constant altitude
What is energy?
The ability to do work
What is The Law of Conservation of Energy?
Energy can’t be created or destroyed, it can only be transferred from one store to another
