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関連する概念動画

Friction: Problem Solving01:17

Friction: Problem Solving

Friction is an essential force that influences the motion of objects in daily life. Depending on the situation, it can be either beneficial or problematic. Consider a bus with a mass of three megagrams and its center of mass at a specific point, moving along a banked road at a constant speed. The coefficient of static friction between the tires and the road is 0.5. Find the maximum angle of the banked road at which the bus would not slip or tip.
Initially, a visual representation of the...
Rolling Resistance01:21

Rolling Resistance

When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
Rolling Resistance: Problem Solving01:17

Rolling Resistance: Problem Solving

Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
Rolling Without Slipping01:09

Rolling Without Slipping

People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is essential...
Rolling With Slipping01:14

Rolling With Slipping

Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can affect...
Design Example: Designing Water Slide01:18

Design Example: Designing Water Slide

When designing a water slide, controlling the speed of water flow is crucial for rider safety while maintaining an exciting experience. As water flows down the slide, gravity causes it to accelerate, with its speed at the bottom depending on the height from which it starts. The higher the slide, the more potential energy the water has at the top, which is converted into kinetic energy as it descends, increasing its speed.
Bernoulli's principle determines the water's velocity along the slide.

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関連する実験動画

Updated: Jul 7, 2026

Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
06:55

Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling

Published on: August 5, 2016

オランダの科学:平凡さの滑らかな斜面に?

M Enserink

    Science (New York, N.Y.)
    |September 6, 2007
    PubMed
    まとめ

    オランダの科学は認知度において優れているが,課題に直面している. 投資の減少,科学者のキャリアの減少,女性の参加率の低下は,すぐに研究者の不足を引き起こす可能性があります.

    科学分野:

    • オランダの科学的成果と世界の地位.
    • 科学的研究開発における動向の分析.

    背景:

    • オランダの科学は,ノーベル賞や引用によって高い国際的評価を得ている.
    • オランダの科学競争力の潜在的低下に関する懸念がある.

    研究 の 目的:

    • オランダにおける科学研究の現状と将来の軌道を評価する.
    • 国の科学的な優位性に影響を与える重要な要因を特定する.

    主な方法:

    • 過去20年間の科学支出に関する歴史的データの分析.
    • 科学的キャリアの人気に関する傾向の検討.
    • 科学分野における女性の参加率の評価.

    主要な成果:

    • オランダは,科学費の主要な支出国としての地位を低下させました.
    • 科学のキャリアは人気が減っています.
    • 科学分野における女性の過小代表は,依然として懸念されるレベルにとどまっている.

    結論:

    • 観測された傾向は,近い将来,研究者の重要な不足につながる可能性があります.
    • 科学的卓越性を維持するために,投資と参加の減少に対処するために,緊急の注意が必要です.

    さらに関連する動画

    Image-based Lagrangian Particle Tracking in Bed-load Experiments
    10:32

    Image-based Lagrangian Particle Tracking in Bed-load Experiments

    Published on: July 20, 2017

    Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall
    12:21

    Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall

    Published on: January 6, 2023

    関連する実験動画

    Last Updated: Jul 7, 2026

    Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
    06:55

    Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling

    Published on: August 5, 2016

    Image-based Lagrangian Particle Tracking in Bed-load Experiments
    10:32

    Image-based Lagrangian Particle Tracking in Bed-load Experiments

    Published on: July 20, 2017

    Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall
    12:21

    Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall

    Published on: January 6, 2023