work Flashcards
when can work done be equal
when an object moves in the same direction as the force exerted
what is the equation for work
work = force x distance
work = mass x gravity x distance
what is work done
work done is when force is applied to a body causing movment
what is mechanical work
the amount of energy transferred by a force
what is mechanical work measured in
joules
other than joules what can mechanical work be measured in
Newton metres
name three other units of work or energy that are not si units but are commonly used
kilowatts - for measurements of electrical energy
calorie- food energy
BTU(british thermal units)- heat energy
define joules
this is the unit of measurements for energy
if mass of 100kg was lifted 10m calculate the work done
f= weight = m x a = 981
10 x 981 = 9810J
energy is categorised in what two groups
kenetic and potential
what is kenetic energy
the energy an object has due to its movments
what is potential energy
energy that is stored in an object
