Besaran dan Satuan

Summary

This video lecture introduces basic physics concepts, focusing on fundamental and derived quantities such as length, mass, time, and temperature. The lecturer explains the difference between mass and weight, emphasizing the role of gravity in weight measurement. Practical applications in fields like mining and geophysics are discussed, highlighting measurement tools used in these industries. The session concludes with an assignment for students to create a report on measurement tools in mining, reinforcing the importance of understanding physical measurements in real-world scenarios.

Takeaways

• 😀 The course is delivered via YouTube to overcome network issues, providing flexible access to learning materials at any time.
• 😀 The lecture focuses on basic physics concepts, particularly physical quantities and their corresponding units.
• 😀 Understanding physical quantities and units is crucial for accurate measurement in science and engineering.
• 😀 There are two main types of physical quantities: base quantities (e.g., length, mass, time) and derived quantities (e.g., area, velocity, acceleration).
• 😀 Base quantities have established standard units, such as meter for length and kilogram for mass, that do not change.
• 😀 Mass is a constant property of matter, whereas weight varies depending on the gravitational force (e.g., on Earth vs. the Moon).
• 😀 Temperature can be measured using different units: Celsius, Kelvin, and Fahrenheit, with Celsius being commonly used in Indonesia.
• 😀 Derived quantities are obtained by combining base quantities in formulas (e.g., velocity is length divided by time).
• 😀 Understanding the difference between mass and weight is essential for accurate measurement in physics.
• 😀 An assignment is given to students to research and report on measuring instruments used in the mining industry, to be submitted in PDF format.
• 😀 The lecturer emphasizes the importance of understanding measurement tools in various real-world applications, especially in fields like mining.

Q & A

Why was YouTube chosen as the platform for this online class?

YouTube was chosen as the platform because it allows students to access the lecture at any time. This eliminates issues with unstable internet connections or interruptions, ensuring that students can watch the lecture at their convenience.

What is the focus of the first lecture in the course?

The first lecture focuses on the basics of physics, particularly on quantities and units of measurement. It introduces fundamental concepts like the difference between mass and weight, and how various physical quantities are measured.

What are the two main categories of physical quantities?

The two main categories of physical quantities are fundamental quantities (or base quantities) and derived quantities. Fundamental quantities include units that have been predefined, while derived quantities are based on combinations of these fundamental quantities.

Can you name the seven base quantities in physics?

The seven base quantities in physics are: length, mass, time, electric current, temperature, amount of substance, and luminous intensity.

What is the difference between mass and weight?

Mass refers to the amount of matter in an object and is constant, while weight is the force exerted by gravity on an object and can vary depending on the strength of gravitational forces. For example, an object's weight is different on the Moon compared to Earth due to the difference in gravity.

How can you calculate the weight of an object?

Weight can be calculated by multiplying an object's mass by the acceleration due to gravity (W = mass × gravity). For Earth, gravity is approximately 9.81 m/s².

What is the significance of the Kelvin temperature scale?

The Kelvin scale is important in scientific measurements because it starts from absolute zero, the point where molecular motion ceases. This scale is used in scientific contexts, especially in thermodynamics and physics, where precise temperature measurements are crucial.

How does temperature measurement differ across different scales?

Temperature can be measured using different scales such as Celsius, Fahrenheit, and Kelvin. Celsius is commonly used in most countries, Fahrenheit is used primarily in the United States, and Kelvin is used in scientific contexts.

What are some examples of derived quantities in physics?

Examples of derived quantities include speed (meters per second), acceleration (meters per second squared), force (newtons), and density (kilograms per cubic meter). These quantities are derived from combinations of base quantities.

What is the task assigned to students in this first lesson?

Students are assigned to create a report on measuring instruments used in mining. They are required to research and write about various measuring tools, then submit the assignment in PDF format via email.