Feature Post

Sunday, October 16, 2011

Work and energy

As we know the law of conservation of energy: energy is always conserved.

The work is a product of power, and during the trip, it moves. Imagine pushing a heavy box across the room. In addition to moving more work to do! If W is work, F the force acting around the corner? and s after the trip.

W = FsCos?

Energy comes in many forms. We see here is the kinetic energy (KE) and potential energy (PE)

Transitional KE = ½ mv2

Rotational KE = ½ I2

where I is the moment of inertia of the object (a simple way to understand the moment of inertia is to consider that the same mass during the transition KE)

Gravitational PE = mgh

where h is the height of the object

Elastic PE = kL 2 ½

where k is the spring constant (how it gives the spring will stretch to a strength of unity) and L is the length of the spring. Simple is not it!

No comments:

Post a Comment