Below students will find a compilation of all the formulas related to the topic of work, energy and power. The list of formulas will help students to revise all the important notes quickly before the main entrance exams.
Work, Power and Energy Formulas
1. Work Done by Constant Force
W = FS cos Ө
It is a scalar quantity
2. Work done by Multiple Forces
W = W1 +W2+W3+….
Work done on the particle is the sum of the individual work done by all the forces acting on the particles.
3. Dimensions of work
Work = [ML2T-2]
4. Kinetic Energy
As mass is a positive quantity kinetic energy is a positive quantity.
K = ½ mv2= p2/2m
p is the linear momentum
5. Potential Energy
F = -dU/dx for conservative forces
UGravitational = mgh
Uspring = 1/2kx2
6. Work energy theorem
According to the theorem, the change in kinetic energy of a body is the net work done by the net force on the body
7. Mechanical energy
Mechanical energy E of an object or a system is the sum of kinetic energy K and potential energy U
E= U+K. Conserved if forces are conservative in nature
Pav = W/t ,
Here W is the work done
t is the time taken