Gravitation
Uttar Pradesh Board · Class 9 · Science
Summary of Gravitation for Uttar Pradesh Board Class 9 Science. Key concepts, important points, and chapter overview.
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Gravitation is the fundamental force that governs the motion of objects on Earth and celestial bodies in space. This chapter explores Isaac Newton's discovery that the same force responsible for an apple falling to the ground also keeps the moon orbiting around Earth and planets revolving around the
Key Concepts
Every object in the universe attracts
Every object in the universe attracts every other object with a force proportional to the product of their masses and inversely proportional to the sq
When objects fall under Earth's gravitational
When objects fall under Earth's gravitational force alone, they experience free fall with acceleration g = 9.8 m/s². All objects fall at the same rate
Mass is the measure of inertia
Mass is the measure of inertia and remains constant everywhere (measured in kg). Weight is the gravitational force acting on an object (W = mg) and va
Thrust is force acting perpendicular
Thrust is force acting perpendicular to a surface. Pressure is thrust per unit area (P = F/A) measured in Pascal (Pa). Same force creates higher press
Buoyant force is the upward force
Buoyant force is the upward force exerted by fluids on immersed objects. Archimedes' principle states that buoyant force equals the weight of displace
Learning Objectives
- Understand the concept of gravitational force and its universal nature
- Learn and apply the universal law of gravitation with mathematical calculations
- Distinguish between mass and weight of objects
- Explain the concept of free fall and acceleration due to gravity
- Calculate weight variations on different celestial bodies like the moon
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