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  • What is the difference between friction and friction energy?

  • Friction energy is the loss of mechanical energy during the friction process resulting from energy dissipation. In general, friction is represented as a friction force in the relevant literature. The friction coefficient is defined as a ratio of two forces.

  • What is the force that causes friction?

  • Friction is an everyday force that is created by two surfaces interacting. When these surfaces slide against each other, this interaction increases the thermal energy of the two surfaces (the temperature goes up).

  • What is the effect of friction on an engine?

  • Friction in engines and machines contributes to energy loss, which is what wears out the parts in a car (hence the need for lubricating oil). Friction is a non-conservative force, meaning energy is transferred to new forms not useful to the system (but doesn’t disappear from the universe, see conservation of energy).

  • What is the thermal energy generated during friction braking?

  • Figure 1. The thermal energy generated during friction braking can be seen in this friction brake/rotor set-up during stress testing. Friction is an everyday force that is created by two surfaces interacting. When these surfaces slide against each other, this interaction increases the thermal energy of the two surfaces (the temperature goes up).

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