Energy Losses: Rolling Resistance and Flex
Terms you will need
- energy dissipationEnergy dissipation is the process of energy being lost or spread out, often as heat, during a physical process.
- kinetic energyKinetic energy is the energy an object has because it is moving.
- potential energyPotential energy is the energy stored in an object because of its position or state.
- frictionFriction is the force that opposes the sliding or rolling of one surface over another.
- thermal energyThermal energy is the energy an object has because of the movement of its particles, which we feel as heat.
- work done by frictionWork done by friction is the energy transferred from an object to its surroundings as it moves against a frictional force.
How this topic runs
Energy loss in physical systems occurs through various mechanisms, including rolling resistance and flex. Rolling resistance is the force that opposes the motion of a rolling object, such as a wheel or a ball, when it moves on a surface. Flex, or deformation, refers to the energy lost due to the bending or compression of materials as they interact with each other. These losses are significant in systems where energy efficiency is critical, such as in transportation and mechanical devices. Understanding these losses helps in designing more efficient systems and minimizing unnecessary energy expenditure.
This happens because the object and the surface both slightly deform when they touch. This deformation uses up energy, which means the object slows down over time. You can imagine it like a tire slightly squishing as it rolls on the road, and that squishing costs energy.
Flex, or deformation, refers to how materials bend or compress when they interact. This flexing causes energy loss because the material has to work to return to its original shape. Picture a ball rolling on a soft surface—it sinks in a little and then bounces back up, but not all the energy is recovered, so the ball slows down.
To understand these losses, think of a toy car on a track. As it rolls, the wheels and the track surface both deform slightly. The energy used to create these deformations is lost as heat and sound, making the car go slower.
This is why engineers design wheels and surfaces to minimize these losses in real vehicles and machines.
Key Points
Terms
Tap a term for a plain-language explanation.
Sources & licensing(4)
- Howard DeVoe, Thermodynamics and Chemistry, 2nd edition — www2.chem.umd.edu/thermobook/ (Creative Commons Attribution 4.0)
- Olivier Cleynen, Engineering Thermodynamics — thermodynamicsbook.com/ (Creative Commons Attribution-ShareAlike 4.0)
- Wikipedia contributors — en.wikipedia.org/wiki/Rolling_resistance (Creative Commons Attribution-ShareAlike 4.0)
- Wikipedia contributors — en.wikipedia.org/wiki/Conservation_of_energy (Creative Commons Attribution-ShareAlike 4.0)