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Friction is the reason humans are able to control where they move or why objects can stay in one place, but it is also the reason we must use force and lose energy to move objects and why many materials wear out and break. The reality of friction allows machines to work, humans to walk and cars to drive. However, friction also means that energy needs to constantly be exerted to move any object.

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When two surfaces are in contact, friction stops those surfaces from sliding against each other. All machines make use of friction and without it would have no use. However, friction makes moving large objects extremely difficult and causes surfaces to wear and break. Friction is a physical constraint, but also makes controlled movement and work possible.

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Friction is a force that opposes motion, so it is unhelpful in all situations where the motion of an object is desired. A by-product of friction is that energy is wasted in the form of heat, which can cause problems in temperature-sensitive environments.

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Convection currents move a gas or a fluid from one place to another and are created when there are differences in density or temperature within that gas or fluid. A convection current can also be thought of as a process that moves energy from one place to another. This process is sometimes referred to as convection heat transfer.

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Friction is the resistance force that appears when two bodies or substances are rubbed together. It slows things down and opposes motion. Without friction, people would not be able to walk, run, write or play sports. Things would continue to move unless they hit anything in their way. Static friction also holds screws and nails in wood and without it, the parts wouldn't hold together.