Class 9th Science

Class 9th Science introduces concepts of physics, chemistry, and biology, covering topics like motion, force, energy, acids, bases, cell structure, reproduction, and natural resources. ????⚡????

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Sudip saha

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English

Last updated

Sat, 16-Aug-2025

Course description

Class 9 Science introduces students to advanced concepts in physics, chemistry, and biology, covering motion, force, energy, sound, light, acids, bases, metals, cell structure, reproduction, heredity, and natural resources. Through experiments, activities, and practical applications, students develop observation, analytical, and problem-solving skills, building a strong foundation for Class 10 Science and beyond.

What will i learn?

  • Concept Clarity – Students understand the differences between speed, velocity, and acceleration. Scalar vs. Vector Understanding – Ability to identify which quantities are scalar (speed) and which are vector (velocity, acceleration). Formula Application – Students can correctly use formulas to calculate speed, velocity, and acceleration. Problem-Solving Skills – Develops the ability to solve numerical problems related to motion. Real-Life Connection – Students can relate these concepts to everyday situations like driving a car or riding a bike. Scientific Terminology – Learners become comfortable using terms like displacement, rate of change, and vector.

Requirements

  • Conceptual Understanding – Students must know the definitions of speed, velocity, and acceleration. Distinguishing Scalar & Vector Quantities – Recognize that speed is scalar, while velocity and acceleration are vectors. Formula Knowledge – Ability to recall and apply the formulas: Speed = Distance ÷ Time Velocity = Displacement ÷ Time Acceleration = Change in Velocity ÷ Time Practical Application – Provide real-life examples for each concept. Numerical Understanding – Ability to calculate simple problems using the formulas. Scientific Terminology – Use proper terms like displacement, rate, and vector.

Frequently asked question

Speed: Speed is the distance traveled by an object per unit time. It is a scalar quantity (only magnitude, no direction). Formula: Speed = Distance Time Speed= Time Distance ​ Example: A car travels 100 km in 2 hours. Speed = 100 ÷ 2 = 50  km/h 100÷2=50 km/h. Velocity: Velocity is the rate of change of displacement of an object with time. It is a vector quantity (has both magnitude and direction). Formula: Velocity = Displacement Time Velocity= Time Displacement ​ Example: A car moves 50 km north in 1 hour. Velocity = 50 km/h north. Acceleration: Acceleration is the rate of change of velocity of an object with time. It is a vector quantity (has magnitude and direction). Formula: Acceleration = Change in Velocity Time Acceleration= Time Change in Velocity ​ Example: A car increases its speed from 20 m/s to 30 m/s in 5 seconds. 𝑎 = 30 − 20 5 = 2  m/s² a= 5 30−20 ​ =2 m/s²

Sudip saha

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Free

Lectures

11

Skill level

Beginner

Expiry period

Lifetime
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