Relationship Between Work, Energy, and Power

Power is the rate at which work is done and to do work you require energy.

P = E (Joules)
      -----------
       t (time)

W= FD ( force x distance)

Suppose there is a force  F acting on an object, causing it to move in a particular direction. Then the work done by the force is the component of F in the direction of motion × the distance the object moves as a result. Work done is measured in joules (J). 

However, if this force is at an angle of a to the horizontal and the body moves a distance of s metres along the ground, then the work done is F cosa × s (since F cosa is the component of the force in the direction of motion).

** If energy is conserved, no work is done. if it is not conserved, it is used to do work.

There are two main types of energy: kinetic and potential

The kinetic energy (K.E.) of a body is the energy an object has as a result of its motion. An object which has no motion will have zero kinetic energy, therefore.

                          K.E. = ½ mv²
   where m is the mass and v is the velocity

Potential energy (P.E.) is the energy an object using height to its advantage

                         G.P.E. = mgh
where h is the height of the body above the ground.

Basically, the total potential energy measures the energy of the body due to its position.

All three variables are dependent on one another and if one was missing, the others wouldnt exist.

Ready, Set, Fire!!!

From watching many movies of the past, we have observed a weird device when loaded with gunpowder would shoot up and cause objects at far distance to explode. KABOOOMMM.. Now what is this device called?  Wait, wait! I'll tell you ;) : a cannon. A cannon is any piece of artillery that uses gunpowder or other usually explosive-based propellants to launch a projectile. They were very popular weapons in the 18th and 19th centuries. However we have newer technology which can also be referred to as cannons today such as guns, howitzers, mortars, etc.. One of the tips to making a successful cannon is following the general rule which is the longer the barrel, the longer the range of the cannon. To shoot the cannonballs to a great distance, large amounts of gun powder would be required as well. The Tsar Cannon is the largest Howitzer made weighing at 39.312 tonnes and has a length of 5.34 m

A view of the Tsar Pushka, showing its massive bore and cannonballs,
 and the Lion's head cast into the carriage.