When it becomes difficult for an object to freely move across a surface, friction may be the preventing force. Friction is the resistance of motion when an object rubs against and acts in the opposite direction of another object. When any two objects rub against each other they cause friction. Friction is a force that holds back another object from freely moving. A simple example are the brakes on an automobile.
当物体难以在接触面自由移动时,摩擦力可能是其阻力。摩擦力是物体运动表面相互摩擦产生的,其方向与物体相对运动方向相反,阻力是物体磨擦时,产生的的反方向作用力。任何两个物体相互摩擦,都会产生摩擦力。摩擦力是阻碍相互接触的物体阻碍另一物体自由移动的力。一个简单的例子是在汽车刹车。
Friction causes a second object to lose energy by slowing its motion. The energy does not disappear, but it changes from moving energy, which is called kinetic energy to heat energy or thermal energy. When a person rubs their hands together friction is generated and then it turns into heat. This is why cold hands become warm after rubbing them together. This is also called kinetic friction.
摩擦导致第二对象通过能量消耗从而减速。能量不会消失,但它从移动的能量,也就是所谓的动能转热能。当一个人搓自己的双手会产生摩擦力,然后将其转变成热量。这就是为什么冰冷的手相护揉搓后会变得温暖。这也被称为运动摩擦。
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