make sure you sand off all the wood(you have to make ur work in to dust, then that is the best quality finish).
you can wear safety glasses when sanding and cutting wood.
Balsa wood has no outstanding health hazards associated with it. The primary safety hazard is that of fire from the wood itself or from sawdust created by working the wood.
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Oak wood burns at a temperature of 1300 to 1600 degrees C. When burning wood, it is important to use proper safety precautions.
Medium sandpaper is best for sanding wooden furniture.
A sanding block is basically just a small piece of wood or other material covered with a sanding belt or sand paper.
Sanding or planing.
construction
If it's a wood deck, then sanding is the best option. Pressure washing will damage the wood which will have to be repaired by sanding. Also, if the coating has a tenacious bond, pressure washing will not get ir all up. The rest will need to be removed either chemically, or mechanically by sanding.
physical
Yes, it is a physical change.
Yes, they can, but are not as effective as good sandpaper.