work and power Flashcards
what are the 8 types of energy?
- thermal
- kinetic
- chemical
- gravitational potential
- elastic potential
- electrostatic
- nuclear
- magnetic
what does work done mean?
energy transferred (by a force)
equation for work done?
work done = force x distance moved in one direction
what are the units for the work done equation?
work done - Joules (J)
force - Newtons (N)
distance - Meters (M)
what is power?
the amount of energy transferred every second
OR
the rate of work done
what is the equation to work out power?
power = work done/time taken
what are the units for the power = workdone/time taken equation?
power - Watts (W)
work done - Joules (J)
time - Seconds (s)
what is the equation for the change in GPE?
change in gravitational potential energy = mass x gravitational field strength x change in vertical height
what are the units for the equation to find out the change in GPE?
GPE - Joules (J)
mass - Kilograms (Kg)
gravitational field strength - meters per second squared/ Newtons per kilogram (m/s^2 OR N/Kg)
height - metres (m)
what is the equation to calculate kinetic energy?
kinetic energy = 1/2 x mass x (speed)^2
what are the units for the kinetic energy equation?
kinetic energy - Joules (J)
mass - Kilograms (kg)
speed^2 - meters per second (m/s)
conservation of energy.
energy cannot be created or destroyed, only change form
