physics question?

Question

(1) state the principle of conservation of energy.
(2) define the term 'potential energy'.
(3)Give one example of a body both possessing 'kinetic' and 'potential' energies.
(4)Name the three modes of heat transfer.

Answer 1

Convection/Conduction/Radiation is the answer to one of them. But look the rest up on http://www.wikipedia.org. You might learn something.

Answer 2

1) Energy cannot be created or destroyed, it is simply converted from one form to another or one form to several others.
Energy and Momentum are always conserved.

2) Potential energy is something that has the 'Potential' to do work. The easy examples are having a circuit with a voltage but no current (i.e. the Potential in a circuit is like a pump, ready to push electrons round through the wires.)

The other example is when you throw an object upwards and it reaches it's highest point. It then has zero kinetic energy but gains potential energy - given by the equation-:

P.E. = mass x gravitational pull x height of object

3) A waterfall has both kinetic and potential energy. The water at the top has potential energy and is converted to kinetic during the fall on the way down.

4) Conduction, Convection and Radiation

Answer 3

1.the principle of conservation of energy states that "energy can neither be created nor destroyed but can be transformed from one form to another
2.potential energy is the type of energy possesed by a body at its rest position
3.all oscillating bodies has both kinetic and potential energies example pendullum bob
4.three modes of transfer of heat are CONDUCTION