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Friction is considered helpful during situations such as, but not limited to, preventing slipping between the shoes and the floor during walking, preventing skidding between tires and the road while driving, in brake pads where friction causes the vehicle to stop, and in order to grip things to hold them properly. In all of these cases, friction is important and very beneficial to completing the task at hand.

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Friction is a resistance force that slows down or prevents motion. It occurs due to the interaction between two objects that move relative to each other. These objects can be solid, liquid or gas. Friction is the reason that unlubricated bike chains are harder to push and why devices with moving parts wear out with time. Friction is also the reason why these devices generate heat, like in the brake pads, and why it's possible to start a fire by rubbing two sticks together. Thus, in many cases where friction is trying to be reduced, lubrication is used or the surfaces are made to be as smooth as possible. In other cases where friction is helpful and needs to be increased, rougher surfaces or surfaces made of stickier material, such as rubber, are used.

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## Related Questions

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Some examples of frictional forces include the force between shoes and the ground when walking, the force between tires and the road while driving, and the force between a falling object and the air surrounding it. Many machines also involve the use of frictional forces.

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Total dynamic head is the total pressure when fluid is moving through a system which includes the pressure needed to overcome elevation differences and the pressure needed to overcome friction losses in order to produce a required pressure output. This measurement is usually expressed in either feet or meters, and refers to the equivalent height of the column of fluid in a manometer.

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Brake pad thickness is important because, over time, the friction between the brake pads and the rotors wears down the pads, necessitating replacement. When brake pads are less than 3 mm thick, they should be replaced with fresh pads. Since they are always replaced in pairs, only one pad needs to be worn down to necessitate the replacement of both pads.