Name: scalar quantities in physics
Uploaded: 2023-09-22T11:49:38.000Z
Duration: 1 min 21 s
Channel: JoVE
Description: Scalar quantities in physics have size only. They do not include direction. This makes them different from vector quantities. Common scalar examples include mass, temperature, time, and energy. Each one can be described with a number and a unit. Because direction is not part of the value, scalars are often easier to compare and measure.

시간, 질량 및 거리와 같은 물리량은 크기는 있지만 방향은 없습니다. 이러한 수량을 스칼라 수량이라고 합니다.
그것들은 숫자 값으로 표현되고 그 뒤에 물리적 단위가 옵니다. 예를 들어, 사과 한 알의 질량은 100g입니다. 
스칼라는 벡터가 크기와 방향을 모두 가지고 있기 때문에 벡터와 다릅니다.
예를 들어, 물체의 질량은 물질 내 물질의 양에 따라 달라지며 스칼라 양입니다.대조적으로, 지구의 중력으로 인해 가해지는 힘인 무게는 벡터의 양입니다.
마찬가지로 distance는 스칼라 양이고 물체의 위치 변화인 displacement는 벡터 양입니다.
스칼라는 이탤릭체로 표시됩니다.
스칼라는 전자의 전하나 온도계 눈금의 판독값과 같이 음수일 수 있습니다.
여기서 빼기 기호는 개체의 규모 또는 특성에 있는 점을 나타냅니다.
섭씨 온도계와 화씨 온도계의 경우 저울은 서로 다른 지점에서 0을 읽습니다. 따라서 음의 온도도 다른 스케일 판독 값에서 읽습니다.

스케일러 소개

하나의 숫자와 적절한 단위를 제공함으로써 사라들에게 익숙한 물리량을 지정할 수 있습니다. 예를 들어, '수업 시간은 50분입니다.' 또는 '내 차의 주유소 용량은 65L입니다.' 또는 '' 두 기둥 사이의 거리는 100m입니다. 이렇게 완전히 특정할 수 있는 물리량을 스칼라량이라고 합니다. '스칼라'라는 단어는 '숫자'의 동의어입니다. 시간, 질량, 거리, 길이, 부피, 온도, 에너지 등이 그 예입니다. 스칼라 수량입니다.

동일한 물리적 단위를 갖는 스칼라 수량은 숫자에 대한 일반적인 대수학 규칙에 따라 더하거나 뺄 수 있습니다. 예를 들어, 50분보다 10분 먼저 끝나는 수업은 50분 동안 진행됩니다. − 10분 = 40분 마찬가지로 옥수수 60칼로리에 이어 도넛 200칼로리를 먹으면 60칼로리 + 200칼로리 = 260칼로리의 에너지를 얻을 수 있습니다. 스칼라 양에 숫자를 곱하면 동일한 스칼라 양을 얻지만 더 큰(또는 더 작은) 값을 얻습니다. 예를 들어, 어제 아침 식사의 에너지가 200칼로리이고 오늘 아침 식사의 에너지가 어제의 4배라면 오늘 아침 식사의 에너지는 4칼로리입니다. 200칼로리 = 800칼로리의 에너지. 두 개의 스칼라 수량을 서로 곱하거나 나누어 파생 스칼라 수량을 형성할 수도 있습니다. 예를 들어, 기차가 1시간 동안 120km의 거리를 주행하는 경우 속도는 120,000m/3600s = 33m/s입니다. 여기서 속도는 거리를 시간으로 나누어 얻은 스칼라 수량입니다.

이 텍스트는 <a .="" href="https://openstax.org/books/university-physics-volume-1/pages/2-1-scalars-and-Vectors">Openstax, 대학 물리학 1권, 섹션 2.1: 스칼라 및 벡터.</a>

많은 친숙한 물리량은 단일 숫자와 적절한 단위를 제공하여 완전히 지정할 수 있습니다. 예를 들어, "수업 기간이 지속됩니다 ...

Education

교육

JoVE Core

Mechanical Engineering

기계공학

Unit 1

제1단원

Physics Basics

물리학 기초

KEY TERMS AND CONCEPTS

주요 용어 및 개념

Introduction to Scalers

scalar quantities in physics

Scalar quantities in physics have size only. They do not include direction. This makes them different from vector quantities.

Common scalar examples include mass, temperature, time, and energy. Each one can be described with a number and a unit. Because direction is not part of the value, scalars are often easier to compare and measure.

Scalar Quantities in Physics

introduction to scalers

Scalar quantities in physics have size only. They do not include direction. This makes them different from vector quantities. Common scalar examples include mass, temperature, time, and energy. Each one can be described with a number and a unit. Because direction is not part of the value, scalars are often easier to compare and measure.

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

How Mass Differs from Weight

Mass and weight are related, but they are not the same. Mass is the amount of matter in an object. Weight is the force of gravity acting on that object. This difference matters because mass stays the same even when gravity changes. Weight can change if the gravitational pull changes. A person or object therefore has the same mass, but not always the same weight. The terms are often used in everyday speech as if they mean the same thing. In physics, they describe two different ideas.

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 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.

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 scalar quantities are used in physics, with clear examples like mass, temperature, time, and energy for high school students.

Scalar Quantities in Physics | JoVE K12

JoVE Core Mechanical Engineering offers concise, easy-to-understand animated videos covering key topics such as equilibrium, forces, truss analysis, and structural mechanics. Explore their real-world applications, and witness these concepts in action through scientist-led experiments.

mechanical engineering

Scalar Quantities in Physics

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Transcript