Work and energy
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Work
The formula of work is: W=f*x (Work equals the product of force times distance). The movement and force must be in same direction. For example carrying your backpack for a kilometer is not counted as work but going upstairs with your backpack is counted as work. The rule is the angle between the force and the object must be 0 degrees for that to be counted as work so you do do some work lifting your bag however you don't do while carrying it.
- No! Because since you are doing some effort while carrying your bag it is counted as you have done some work. The force that does the work is called the force of the friction and the distance is how far you've carried it.
However carrying bag needs some effort lets say 10N but you use that effort to stabilize it you don't move it so it does not move so f=10N x=0 W=10.0=0
[edit] Energy
See the main article, Energy
In this topic we'll use only mechanical energies. There are two kinds of mechanical energies. Potential and Mechanical Kinetic. These energies can transform to one to another like all other kinds of energies.
Potential energy
Potential energy is an energy that every object which as distance from floor and a mass. Formulised as mgh=Potential Energy.potential energy=mgh m=mass,g=gravitaionalforce,h=height.
Kinetic Energy
Actually kinetic energy is what happen when that object falls down. Formulised as 1/2m.v.v
Relationship of work and energy
Every work gives an object energy like taking your bag from the floor or pushing your sledge. The best way to tell this is a formula
W=f.x=m.g.h=1/2.m.v.v
[edit] See also
wd=f*s(distance
