Grazing your knees and hands when falling over and sliding on a hard surface is caused by friction with the ground. A spacecraft returning to earth will heat up to red hot due to friction with the atmosphere. These are just two bad effects of friction. But, there are good effects, too. Friction from your vehicle or bicycle brakes will bring you to a stop! Friction from your tyres and the road surface will prevent you from skidding.
Rugburn on your knees
Good effects - It can keep you entertained Bad effects - You may become a weeaboo
bad friction is when 2 things rub together .
Friction that effects the object in motion. insignificant friction is friction that is so small it is negligible.
Some of the good effects of friction are also the bad effects.Good effects:Stops or immobilises objects including cars, trucks and humans from sliding down a slope;Allows humans to walk - pushing off from the back foot and not falling over (think about walking on ice or worse, running on ice);Allows objects to remain where they are ie remain at rest, to be leant on;...Bad effects:Causes the production of heat between surfaces when the objects move eg car tyres and brakes heat up due to friction. Engines have to be oiled to reduce the friction of the moving parts. If the engine runs out of oil then the motor will seize due to friction (did that once - new engine required);Friction causes wear on surfaces that slide on one another - even our shoes wear out due to friction with the ground;Friction with air causes air craft, rockets and meteors to heat;...
Friction isn't always bad, but when engineers try to avoid or reduce friction, it is because of the energy lost due to friction.
Friction will reduce an object's speed.
By adding or losing eletrons (friction)
Having a lot of friction can be bad when you want smooth motion between two surfaces, as it can cause heat, wear, and energy loss. In some cases, high friction can also lead to difficulties in moving objects or machinery.
heskey time
Static. and when you rub two objects together it will become warm or hot
Friction is good in situations like walking or driving a car, where it provides traction to prevent slips and skids. Friction is bad in situations like mechanical parts rubbing together, where it can cause wear and heat generation, leading to inefficiency and potential damage.