Name: friction and energy loss in motion
Uploaded: 2023-04-30T10:57:00.000Z
Duration: 1 min 17 s
Channel: JoVE

K12 Standards

north-carolina-k-12-science-standard-course-of-study

NC K-12 Science Standard Course of Study

9-12

Physical Science

Energy

PS.PSc.7.2

Non-conservative Forces

Non-conservative forces are those forces that cause a change in the total energy of the system by converting it into heat, light, or any other form of energy.
Friction, air resistance, and viscosity are a few examples of non-conservative forces. They are also known as dissipative forces as they cause the mechanical energy to be lost or dissipated in the system.
For example, when a car skids on a road, it loses mechanical energy as a part of its kinetic energy gets converted into thermal energy due to friction.
To understand the work done by non-conservative forces, consider two identical objects sliding down two different slides simultaneously.
The object moving on slide A would lose more energy due to friction. Therefore, the work done by the frictional force on slide A is greater than that on B.
Hence, the work done by non-conservative forces is irreversible, cannot be described as a function of potential energy, and depends only on the path taken by the object.

non-conservative forces

Non-conservative forces are dissipative forces such as friction or air resistance. These forces take energy away from a system as it progresses. Unlike conservative forces, non-conservative forces do not have potential energy associated with them. This is because the energy is lost to the system and cannot be turned into useful work later.
Also unlike their conservative counterparts, they are path-dependent; where the object starts and stops does matter. For example, a grinding wheel applies a non-conservative force because the work done depends on how many rotations the wheel makes. In addition, a non-conservative force turns a macroscopic movement into a microscopic movement. For example, when a ball hits a bat, it creates a sound, which is a microscopic motion. Also, the shape of the ball is momentarily deformed due to the collision with the bat; when the ball bounces from the bat, it returns to its original shape. Throughout all of this, the atoms of the ball, bat, and the atmosphere will experience vibration and lose some of their energy in the form of heat.
This text is adapted from <a href="https://openstax.org/books/university-physics-volume-1/pages/8-2-conservative-and-non-conservative-forces">Openstax, University Physics Volume 1, Section 8.2: Conservative and Non-Conservative Forces.</a>

Non-conservative forces are dissipative forces such as friction or air resistance. These forces take energy away from a system as it progresses. Unlike ...

Education

JoVE Core

Physics

Unit 1

Potential Energy and Energy Conservation

KEY TERMS AND CONCEPTS

friction and energy loss in motion

Non-conservative forces, such as friction and air resistance, remove energy from a system as it moves. The energy is not stored as potential energy. Instead, it is lost from the system and cannot be used later for useful work.

These forces are path-dependent, which means the route matters. Where an object starts and stops can change the work done. A grinding wheel is one example, because the work depends on how many rotations the wheel makes.

Non-conservative forces also turn large-scale motion into tiny motions. When a ball hits a bat, the collision creates sound, which is a microscopic motion. The ball also bends for a moment and then returns to its original shape.

During the collision, the atoms in the ball, the bat, and the air vibrate. Some of that energy is lost as heat. This is why non-conservative forces are often described as dissipative forces.

Friction and Energy Loss in Motion

gravitational potential energy

Gravitational Energy from Height and Weight

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Non-conservative forces, such as friction and air resistance, remove energy from a system as it moves. The energy is not stored as potential energy. Instead, it is lost from the system and cannot be used later for useful work. These forces are path-dependent, which means the route matters. Where an object starts and stops can change the work done. A grinding wheel is one example, because the work depends on how many rotations the wheel makes. Non-conservative forces also turn large-scale...

conservation of energy

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force and potential energy in one dimension

force-and-potential-energy-in-one-dimension

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force and potential energy in three dimensions

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Gradient Force from 3D Potential Energy

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energy diagrams - ii

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key terms and concepts

Learn how friction, air resistance, and collisions transfer energy out of a system, why path matters, and how motion becomes heat and sound.

Friction and Energy Loss in Motion | JoVE K12

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Tennessee Academic Standards

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PHYS.PS3.8

Chemistry

CHEM1.PS3.4

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HIgh School

PH.4

PH.4.b

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HS-PS3-5

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PS.PSc.7.4

Analyze energy transfers and transformations within a mechanical system.

Friction and Energy Loss in Motion

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