Answer the following Questions
given below:-
1. What do you mean by
conservation of mechanical energy?
State the condition when it holds.
2 Give one example to show that the
sum of potential energy and kinetic
energy remains constant if friction is
ignored.
3. A ball is made to fall freely from a
height. State the kind / kinds of
energy possessed by the ball when it
is
(a) at the highest point
(b) just in the middle
(c) at the ground.4. State the changes in form of
energy while producing hydro
electricity.
Answers
Answer 1. The principle of conservation of mechanical energy states that if a body or system is subjected only to conservative forces, the mechanical energy of that body or system remains constant.
Answer 2. During the vertical fall of the cylinder tube, if the friction due to air is ignored, the total sum of potential energy and kinetic energy at each point of its remains same.
Answer 3.In the middle of the path the potential energy and kinetic energy remains same because at the highest point above the ground the kinetic energy is zero while potential energy is maximum but as soon as it starts falling the half of kinetic energy gets converted to potential energy and when the ball reaches the ground ...15-Jun-2018
AnswerWhen water from dam falls on the water turbine, the potential energy of the water stored in dam changes into its kinetic energy and this kinetic energy of the water is transferred to the blades of turbine as the kinetic energy which rotates the turbine.As the turbine rotates, it rotates the armature of the generator