Well i just learned the subject and wanna knoe more...
2006-07-24 21:29:23 · 5 answers · asked by [::.D[I]A[N]E.::] 1 in Science & Mathematics ➔ Other - Science
the main point of the topic...what is inside and what is the most important point...
2006-07-24 21:43:10 · update #1
in the universe, forces exist. There are 4 of them :
- gravitational
- electromagnetic
- weak nuclear
- strong nuclear
If you want to jump in the air, you'll have to "work" against the gravitational force... you'll have to "spend energy" to do so...
If you want ot know more about all this, start reading the corresponding articles in the wikipedia.
2006-07-24 21:34:54 · answer #1 · answered by Anonymous · 0⤊ 0⤋
In Newton's theory, force is by definition that which causes acceleration, that is, a change in speed and/or direction of the motion of a massive object.
Work measures how much the force "accomplishes". It is defined by the formula
dW = F// * dx
where F// stands for the force in the direction of the motion, dx for the distance traveled in that direction, and dW for the work. (The symbol "d" is relevant: if the force or the direction is changing, we must split the motion in "infinitisemal" parts to find the correct answer.)
For instance, suppose a 10 kg mass drops from 20 meter height. The force of gravity causes an acceleration of g = 9.81 m/s^2 downward; the force is equal to F = m*g = 10*9.81 = 98.1 Newton.
The work done by this force is
W = F// * x = 98.1 * 20 = 1962 Joules
(F is in the same direction as the motion x.)
Work can be negative; for instance, if you carry something upstairs, gravity does negative work. It accomplishes less than nothing, because it pulls down but the object goes up!
2006-07-25 04:39:13 · answer #2 · answered by dutch_prof 4 · 0⤊ 0⤋
Force = God
Work = Men and woman
2006-07-25 04:44:27 · answer #3 · answered by The Knowledge Server 1 · 0⤊ 0⤋
What are you asking? Be more specific. Are you asking about the laws of physics?
2006-07-25 04:33:45 · answer #4 · answered by boz25 3 · 0⤊ 0⤋
to get thing done
2006-07-25 05:20:21 · answer #5 · answered by bobby h 4 · 0⤊ 0⤋