To reduce the internal energy U of an ideal gas you need the gas to lose heat and/or do work.
Force can be exerted into an object with out it moving, but if you were to move the object due to force it would be considered work. (yes, you can exert force without having the object moving)
A wagon is pulled at an angle of 30 degrees to the horizontal.
They have to have a positive charge and negative so then thats what u get
