science question
2006-11-25 02:46:48 · 8 answers · asked by shaun Craig Marshal 1 in Science & Mathematics ➔ Engineering
When I push the wall, the wall pushes me back. Otherwise i'd have gone thru the wall.
By the way, 'work' in physics does'nt deal with its literary meaning.
2006-11-25 03:12:05 · answer #1 · answered by Banglacat 2 · 0⤊ 0⤋
Ah but you are doing work. If you push against a wall, the energy or pressure you cause is transferred into the wall.
the wall then becomes under stress. It is just that the amount of work ( pressure ) you exert is not enough to push the wall down.
The wall in effect pushes back and cancels out the pressure you are placing on it.
2006-11-25 02:51:57 · answer #2 · answered by Anonymous · 1⤊ 0⤋
hi
for any action there is an equal & opposite reaction.based on this ---
as ur question-the wall will move but the energy u used is not sufficient.
see as u did some work on wall that is moving it at the same time the wall will move u in opposite to the direction of ur force.in the sense ur wasting ur energy in moving it.although the wall never moved but ur energy has wasted.by this u tired.
2006-11-28 20:48:12 · answer #3 · answered by G K 2 · 0⤊ 0⤋
Your muscles are not doing any external work. However, that does not mean they are not dissipating energy.
The way your body is constructed, you get tired if you need to maintain a constant force. The process of generating force converts blood sugar and oxygen to CO2 in your muscles, which is the energy source. If your hand were moving, some of that energy would be work transerred to the external object. If your hand does not move, all of the muscular energy is dissipated chemically and thermally.
2006-11-25 03:24:53 · answer #4 · answered by AnswerMan 4 · 0⤊ 0⤋
because u are exerting force. and the wall is exerting a force called the normal force. a work is done when things are moved in a distance so no work is done by pushing an unmovable wall.
2006-11-25 20:36:53 · answer #5 · answered by Orestes M 1 · 0⤊ 0⤋
The wall is said to possess kinetic energy since it is not moving. It gets this energy because it is stay energy through a gravitational field. As it falls, energy in the gravitational field comes out of storage and is used to move the wall.
The wall has energy, that is, kinetic energy, so, it has the ability to do work. Work on an object occurs when a force is applied to the object, and the object is displaced as a result of the action of this force. This causes energy to be transferred to the object and to yourself. . The wall is doing work. The wall is also pushing, and thus creating its own energy. Energy in the gravitational field comes out of storage and is given to the wall. This energy is realized as the kinetic energy of the wall Since the wall has energy, it has the ability to do work. And the wall is doing work. It is placing forces on the earth and YOU by trying to push it away. The energy transferred to them shows up as their kinetic energy. They have this kinetic energy since they end up NOT moving as a result of work being done on them. and the means of TRYING to move -then the object (you) use up all the energy first
2006-11-25 02:58:49 · answer #6 · answered by gallagher g 4 · 0⤊ 1⤋
DO U KNOW INERTIA OF MATERIALS?ACTUALLY EVERY MATERIAL BODY HAS TENDENCY TO RESIST AGAINST CHANGE IN ITS STATE THE INERTIA VALUE OF WALL IS MUSH GREATER THAN UR FORCE THATS WHY IT DID'NT MOVE BUT U ARE STILL APPLING FORCE THATS WHY U GET TIRED
2006-11-25 03:47:07 · answer #7 · answered by pervaiz elahi bukh soomro 1 · 0⤊ 0⤋
because you are trying to exert force on it.
2006-11-25 02:50:05 · answer #8 · answered by the boss [amj] 2 · 0⤊ 0⤋