To pressure, frictionHope it helped! :)
they will rub your feet during sex
With your finger slowly then steadily faster . Rub in circles then putting slight pressure steadily faster.
Put ice in the inside one and rub the out one. The ice will result in thermal contraction and the friction in thermal expansion. Neither will be large but should be sufficient.
One can use the Brookstone foot massager to its fullest by changing the intensity of the Brookstone foot massager. You could also rub the foot massager around your entire foot.
rubicundity
When you rub two stones together, you typically produce friction which can generate heat. If the stones are of the same material, you may also produce small particles or dust from the abrasion.
rubicundity
Rubella
A match Two sticks (rub together) Flint Stones
Evolution
Friction between stones can generate heat due to the resistance that occurs when the stones rub against each other. This heat can build up enough to ignite any flammable material like dry leaves or twigs present between the stones, resulting in a fire.
Baby just rub it slowly and I'll tell all you need to know!?
Baby just rub it slowly and I'll tell all you need to know!?
Earthquakes
maybe you should get plain white tooth paste and use warm water then rub it with a towel
when the man rub the two stones due to friction the external applied energy change into the heat energy which was seen in the form of fire....