Advertisements
Advertisements
Question
State and explain the work-energy principle. Mention any three examples for it.
Solution
(i) If the work done by the force on the body is positive then its kinetic energy increases.
(ii) If the work done by the force on the body is negative then its kinetic energy decreases.
(iii) If there is no work done by the force on the body then there is no change in its kinetic energy, which means that the body has moved at constant speed provided its mass remains constant.
(iv) When a particle moves with constant speed in a circle, there is no change in the kinetic energy of the particle. So according to the work-energy principle, the work done by the centripetal force is zero.
APPEARS IN
RELATED QUESTIONS
The work done by the conservative force for a closed path is ______
A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then, the long piece will have a force constant of ______
Explain how the definition of work in physics is different from general perception.
Explain with graphs the difference between work done by a constant force and by a variable force.
Calculate the work done by a force of 30 N in lifting a load of 2kg to a height of 10 m (g = 10 m s−2)
