1 there must be movement
2. there must be force
3. the force and satnce the object travels must be in the same direction
At least part of the applied force must be in the same direction as the movement of the object.
The applied force must make the object move.
friction
In order for work to be done there must be a Force F pushing over a distance D. Work=Force x Distance Work only is done in the direction of the Force.
force and something
For electrical appliances to work the wires must be correctly connected and plugged in to the receptacle.
The force must couple to the object. The point of application of the force must be able to move in the direction of the force.
To become a successful stunt man, the completing of many sort of stunts must be done in order for a person to work as a daredevil. One must pass the precision driving testing, fire burns, foot falls, stair falls, high falls and weaponry.
A force must act on a body which, as a result undergoes motion in the direction of the force.
When force is opposite to the direction of motion, no work is done. The object to which the force is applied must move in the direction of the force in order for work to be done.
In order for hydrogen ions to do work , their concentration on each side of the membrane must be different. When the concentrations are the same the system is at equilibrium and can not do work.
Energy in some form must be expended, if the machine is 100 percent efficient the work done in Joules will equal the energy input in Joules, but of course machines are never 100 percent efficient, there are always some losses.
Work to be done "scientifically" the product of Force and Displacement (FD) must be other than zero.
Work is the product of a force and the distance through which it acts in the direction of the force. In order for work to be done, the object must move in the direction of the force. If you push on a brick wall until you exhaust yourself and the wall doesn't move, you have not done any work. If you push on a box and it moves in the direction that you are pushing it, you have done work.