work is the product of force and displacement, SI unit: Joules.
1 Joule is the amount of work done on an object when a force of 1N displaces it by 1m along the line of action of the force.
work: scalar; work done: vector.
for work to be done, a force should act on the object and it must be displaced.
1kJ = 1000J
an object having the capability to do work is said to possess energy. SI unit: J
1J is the energy required to do 1J of work.
of an object at a point above ground is the work done in raising it from the ground to that point against gravity. P
of an object at a height depends on the ground level. depends on the difference in vertical heights of the initial and final positions of the object and not on the path along which the object is moved.
LAW OF CONSERVATION OF ENERGY
of an object = its total mechanical energy
Work and Energy Cheat Sheet (DRAFT) by Ayesha Talib
for students of grade 9