Which will speed up a chemical reaction?
a.
apply heat.
b.
increase the concentration of the reactants.
c.
grind up the substance, so there is more surface area.
d.
all of the above

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )