Name: tension in ropes and strings
Uploaded: 2025-05-22T09:06:17.000Z
Duration: 1 min 10 s
Channel: JoVE

A tensão é descrita como a força associada a uma corda, corda ou cabo firmemente puxado. É uma força de tração, pois só pode puxar um objeto e não pode empurrar um.
Quando uma corda é puxada com força, a força de tensão é transferida através da corda para o objeto anexado. Aqui, a força de tensão equilibra o peso do objeto.
Considere uma caixa de massa 'm' sendo puxada por uma corda em um ângulo em uma superfície lisa com aceleração 'a'.
Nessa situação, as forças na caixa são a atração gravitacional agindo para baixo, a força normal agindo para cima e a força de tensão ao longo da corda puxada.
O componente x da tensão é a única força que atua na direção horizontal.
Na direção vertical, o componente y da tensão atua para cima junto com a força normal, e a atração gravitacional atua para baixo.
A aplicação da segunda lei de Newton ao sistema fornece a força de tensão exercida pela corda e a força normal exercida pela superfície da caixa.

<ol>
	<li>OpenStax. (2019). Física Universitária Vol. 1. [Versão Web]. Obtido de <a href="https://openstax.org/books/college-physics-2e/pages/4-5-normal-tension-and-other-examples-of-forces">https://openstax.org/books/college-physics-2e/pages/4-5-normal-tension-and-other-examples-of-forces</a></li>
</ol>

tensão

A tensão é uma força ao longo do comprimento de um meio, em particular, uma força presente por um meio flexível, como uma corda ou cabo. A palavra "tensão" vem do latim e significa "esticar". Não coincidentemente, os cordões flexíveis que transportam as forças musculares para outras partes do corpo são chamados de tendões. Qualquer conector flexível, como um fio, corda, corrente, fio ou cabo, pode exercer tração apenas em uma direção paralela ao seu comprimento; portanto, uma força transmitida por um conector flexível é uma tensão com uma direção paralela ao conector. É importante entender que a tensão é uma tração em um conector. Considere o ditado "não se pode empurrar uma corda"; a força de tensão apenas puxa para fora ao longo das duas extremidades de uma corda.

Conectores flexíveis são frequentemente usados para transmitir forças ao redor de curvas, como em um sistema de tração hospitalar, uma articulação de um dedo ou um cabo de freio de bicicleta. Se não houver atrito, a tensão é transmitida sem redução. Apenas sua direção muda, e ela está sempre paralela ao conector flexível. Por exemplo, os tendões no dedo transmitem a força dos músculos para outras partes do dedo, geralmente mudando a direção da força, mas não sua magnitude. Os tendões são relativamente livres de atrito. Da mesma forma, um cabo de freio em uma bicicleta transporta a tensão dos guidões para o mecanismo de freio. Novamente, a direção, mas não a magnitude, da força de tensão é alterada.

Tensão

A tensão é uma força ao longo do comprimento de um meio, em particular, uma força transportada por um meio flexível, como uma corda ou cabo. A palavra "tensão" ...

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Education

JoVE Core

Mechanical Engineering

Engenharia Mecânica

Unit 1

Unidade 1

Physics Basics

Fundamentos da Física

KEY TERMS AND CONCEPTS

TERMOS-CHAVE E CONCEITOS

Tension

tension in ropes and strings

Tension is the pulling force carried by a rope, string, or cable when it is stretched by a load. In physics, this force acts along the length of the object and pulls away from the objects at each end.

A stretched rope can support a hanging mass because the tension in the rope balances the weight of the load. The same idea appears in many everyday situations, such as a cable holding a sign or a string lifting an object.

Understanding tension helps students connect force diagrams to real motion. It also shows how forces are transmitted through flexible materials in simple systems.

Tension in Ropes and Strings

introduction to scalers

Scalar Quantities in Physics

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vector or cross product

Cross Product of Two Vectors

The cross product of two vectors gives a new vector that is related to both original vectors. It is also called the vector product. In many physics problems, this operation helps describe quantities that depend on direction as well as size. The result of a cross product has a direction set by the two input vectors. It is not the same as ordinary multiplication. The transcript focuses on the vector or cross product as a core vector operation students use when working with vectors in science.

introduction to vectors

Vectors in Motion and Direction

Vectors describe quantities that have both size and direction. They are used in physics to show how motion, force, and other quantities act in space. A vector can be represented with an arrow. The length of the arrow shows the size, and the arrowhead shows the direction. This makes vectors useful for comparing how one quantity points relative to another. Scalars are different because they have size only and no direction. Understanding the difference between vectors and scalars is an important...

units and standards of measurement

Measurement Units, Standards, and SI Basics

Measurement units, standards, and SI basics help scientists describe physical quantities clearly. A unit gives a number meaning, while a standard provides a fixed reference for that measurement. Together, they make results easier to compare and understand. The International System of Units, or SI, is the most common measurement system in science. It uses agreed-upon base units for common quantities. These standards reduce confusion when measurements are shared across labs, classrooms, and...

accuracy and precision

Measurement Errors, Accuracy, and Precision

Measurement errors can affect how close a result is to the true value and how consistent repeated results are. Accuracy describes how close a measurement is to the accepted or true value. Precision describes how close repeated measurements are to one another. A result can be accurate, precise, both, or neither. A set of measurements may cluster tightly together and still be far from the true value. Another set may include values spread out from one another, even if one of them is close to the...

rules of significant figures

Counting Significant Figures in Measurements

Significant figures help students record measurements with the correct level of precision. They show which digits in a number are meaningful and which only help place the decimal point. In science class, this idea matters when writing and comparing measured values. The rules for significant figures explain how to count these digits in different numbers. Some digits are always counted, while others depend on where they appear in the number. Learning the rules makes it easier to report answers...

random and systematic errors

Measuring Error in Scientific Data

Random and systematic errors affect scientific measurements. Random errors cause values to spread around the true value. They make repeated measurements less consistent. Systematic errors shift measurements in the same direction each time. Understanding both kinds of error helps students judge data quality. Random error can come from small changes during measurement. Systematic error can come from a biased tool or method. Scientists look for these patterns so they can improve results and...

position and displacement

Tracking Motion with Position and Displacement

Position and displacement are key ideas in straight-line motion. Position tells where an object is located compared with a chosen starting point, called the origin. Displacement describes how far and in what direction the object has moved from its starting position. These ideas help describe motion clearly. Position can change as an object moves. Displacement focuses on the change in position, not just the path taken. That makes it useful for comparing motion in a simple and precise way.

position and displacement vectors

Using Vectors to Describe Motion

Position and displacement vectors describe motion in physics. A position vector shows where an object is located relative to a chosen origin. A displacement vector shows how far and in what direction the object moves from one point to another. These vectors are useful because they give a clear way to track movement in space. The video connects position and displacement to the idea of a reference point and shows how direction matters as much as distance. That makes them important for describing...

mass and weight

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acceleration due to gravity on earth

Free-Fall Acceleration on Earth

Free-fall acceleration on Earth describes how fast an object speeds up when gravity is the only force acting on it. Near Earth’s surface, this acceleration is nearly constant for many everyday situations. Gravity pulls objects toward Earth and gives them downward acceleration. This motion is often written as g, and it helps explain why falling objects gain speed as they move downward. The value of g is commonly used in physics to predict the motion of objects dropped or released near the...

tension

Tension is the pulling force carried by a rope, string, or cable when it is stretched by a load. In physics, this force acts along the length of the object and pulls away from the objects at each end. A stretched rope can support a hanging mass because the tension in the rope balances the weight of the load. The same idea appears in many everyday situations, such as a cable holding a sign or a string lifting an object. Understanding tension helps students connect force diagrams to real motion.

gravitational force

How Gravity Acts Between Objects

Gravity is a force that pulls objects toward one another. On Earth, this force gives objects weight and keeps people, water, and other materials from drifting away. It also helps explain why planets and moons stay in motion around larger bodies. The strength of gravitational force depends on the masses of the objects involved. Larger masses create a stronger pull, while smaller masses create a weaker one. The distance between objects also matters, because gravity becomes weaker as objects move...

key terms and concepts

Learn how tension acts in ropes, strings, and cables as a pulling force that supports loads and balances weight in everyday physics examples.

Tension in Ropes and Strings | JoVE K12

O JoVE Core Mechanical Engineering oferece vídeos animados concisos e de fácil compreensão que abrangem tópicos-chave como equilíbrio, forças, análise de treliças e mecânica estrutural. Explore suas aplicações no mundo real e observe esses conceitos em ação por meio de experimentos conduzidos por cientistas.

mechanical engineering

Tension in Ropes and Strings

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