unit review- energy, work, power Flashcards
chemical energy
energy required to bond atoms together
e.g. in food, fuel and electric batteries
kinetic energy
the energy an object has due to motion
e.g. in moving objects
gravitational potential energy
depends on height
e.g. in objects raised about a planet’s surface
elastic potential
associated with objects that can be stretched or compressed
e.g. in a stretched, compressed or twisted object
thermal energy
in any heated objects
magnetic energy
in any object with a magnetic field
electrostatic energy
in electrostatic forces between charges
nuclear energy
released in the form of light and heat energy as the nucleus splits / the forces acting between atomic nuclei
what is energy?
the ability to do work, it cannot be created nor destroyed but can be transformed from one form to another
what is work?
when a force moves an object it does work and energy is transferred to the object
GPE formula
m x g x h ( J )
KE formula
1/2mv^2 ( J )
work formula
force x distance
efficiency formula
useful energy output/energy input x 100%
what is power
power is the rate at which work is done (W)
