Aforce acts on an object and moves it a certain distance. the product of the force and the distance is the done on the object.

Answer is Work. Because work is done when force acts on object and the object displaces from position upto a distance...

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.