A wheel is an example of rolling friction.
An example of rolling friction would be if you took kyle leary and folled him down a hill. his fat touching the grond would create rolling friction
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Some friction will occur with seemingly smooth surfaces because at a molecular level, nothing is smooth.
Water does reduce friction, as the liquid essentially lubricates the surface between the two objects. However, this only applies to affecting other friction. It has its own friction when objects move through a body of water.
Friction :) it says so in in my science book.
Speed is how fast something is moving. When to things are traveling at the same speed and rubbing together, they can cause friction.
A force is a push or pull on an object some ex are friction