Re: Work, gravity, potential energy
- From: kdthrge@xxxxxxxxx
- Date: 16 Jan 2006 16:51:57 -0800
Work = force x distance of applied force x cosine of theta.
For a force applied in the direction of displacement cosine is 1. An
object on the ground feels the force of 1 g. If the object is
accelerated upwards at 32 ft..sec^2, there will be a 2 g force. If
gravity is considered negative, the force of gravity x the negative 1
cosine, gives the positive value of the force of gravity to be added
the force of the acceleration. Gravity accelerates all matter and parts
of a body uniformly since it is proportional to mass and inertia is
proportional to mass. Therefore the force of an object on the ground,
is that of being accelerated and then stopped simultaineously. Which
gives it the same change in inertia that would be experiencied in an
acceleration away from the earth.
If an object is traveling at 90 degrees to the force of gravity,
gravity still acts upon it with it's value in the direction that cosine
is 1. The cosine of 90 is zero. Gravity does not act 'against' the
momentum at 90 degrees motion. It does add exactly it's value to the
kinetic energy. For an object increasing in distance from the earth,
the force of gravity will be positive work done 'against' the momentum.
If falling it will be negative work done 'against' the momentum.
Kent Deatherage
http://home.earthlink.net/~kdthrge
.
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