motion, forces, and energy

Surface Energy - We know that work has to be done in order to bring a molecule, from interior to the surface, against the force of cohesion. If the surface area is increased, more molecules can be accommodated at the surface. Increase in surface area, results in cooling. To main..

Energy is a number that we associate with a system of one or more objects. If a force acts on one of the objects, making it move, then the number changes. After countless experiments, scientists and engineers realised that if the scheme by which we assign these energy..

The energy produced due to the 'fission of nuclei' of certain heavier elements (such uranium), or by the 'fusion of nuclei' of lighter elements (such as hydrogen), is called nuclear energy . Nuclear reactions generate very large and powerful amounts of energy. They ca..

A dancing or running man is said to be more energetic than a sleeping man. In physics, a moving particle is said to have a more energy than an identical particle at rest. Quantitatively, the energy of the moving particle is given by The kinetic energy of a system of pa..

Every organism has a tendency to increase its entropy, which is very much in accordance with the second law of thermodynamics. In order to maintain its organisation at the molecular, cellular and organismic levels, every organism is forced to obtain energy from its surroundings..

To cause a displacement of a body controlled by elastic forces, work has to be done. For example, work has to be done in stretching a spring against the elastic forces. This work will be stored in the body as potential energy. When the deforming force is rel..

Balanced And Unbalanced Forces - The figures show a block of wood on a table. When the block is pulled at point A, it begins to move towards the left and if the block is pulled at the point B it moves towards the right. Example of Balanced Forces In a game of tug of war when bot..

Newton's second law of motion gives a quantitative definition of force. Impulse Mathematical representation of Newton's second law of motion is or When the time of application of force is short then Ft is defined as impulse. Impulse is a large force..

. A second borehole is then drilled into the cracked rocks. Water is pumped down the first hole and forced through the cracks. The water gets heated and returns through the other hole as hot water. This energy equals to that stored in 10,000 million tones of coal. In some parts ..

Water, being a vital resource for all living beings, is also an important source of energy. Hydropower supplies 6% of the world's energy needs. Moving water is highly energized. A hand held into a fast flowing stream can feel the pressure of water trying to push the hand along. ..