Friction generates HEAT. Heat can burn you. Rub your left arm with your right arm using a lot of pressure. It will get uncomfortably hot very quickly!
Ratchetgirl! :d
harmful friction is when friction can do harm or be a problem for example of this is if your skiing down a hill with grass you will have to much friction then you fall and get hurt :p
An air hockey table with the air turned on has almost no friction. Other than that, very smooth surfaces cause very little friction. If you use certain types of cleaner on hardwood floor, it can be turned into a surface with little or no friction (and you will fall an hurt yourself a lot. not suggested.)
Static Friction and Kinetic Friction. Static Friction is what friction that slows you down. While Kinetic friction is sliding friction.
Lubricants reduce friction by replacing sliding friction with fluid friction.
it can hurt them because what if they were to fall they would get hurt and it would hurt more if they were on the top of a pyramid.
Ratchetgirl! :d
because you are using friction or fire
because of the friction created between the t-shirt and the nipples....
Think of a car, friction causes air resistance on the car and results in lower gas mileage, but without friction, the tires would just spin in place and the car would not go anywhere.
The vibrations of the throat cause friction and damage cells.
Well, if they were light or had nothing in them it wouldn't hurt but if it was full gravity would bring it to your head causing friction and pain.
The reason the back of your hand hurts after playing soccer is because of the friction.
harmful friction is when friction can do harm or be a problem for example of this is if your skiing down a hill with grass you will have to much friction then you fall and get hurt :p
An air hockey table with the air turned on has almost no friction. Other than that, very smooth surfaces cause very little friction. If you use certain types of cleaner on hardwood floor, it can be turned into a surface with little or no friction (and you will fall an hurt yourself a lot. not suggested.)
It may, under certain circumstances. For example, if you brake suddenly, the tyres might wear off quickly.
Probably just friction, but if more than a week has passed and it still hurts, then get a blood test.