Unit 05 Gravitation Numericals in pushto language-Asaanphysics by Asad ullah khan

Numericals of Gravitation – Class 9 (Physics, Unit 5) – Best Description in English Gravitation is one of the fundamental forces of nature, and its numerical problems help students understand how masses interact through gravitational force. In Class 9 Physics, Unit 5 (Gravitation), numerical problems generally focus on: 1. Newton’s Law of Universal Gravitation Formula: F = G (m₁m₂) / r² Questions involve calculating the gravitational force between two objects using given masses and distances. 2. Acceleration Due to Gravity (g = 9.8 m/s² on Earth) Formula: W = mg (Weight of an object) Questions may require calculating the weight of an object on Earth or other planets. 3. Variation of Gravity with Height and Depth Formula: g' = g (1 - 2h/R) for height Problems involve determining how gravity changes at different altitudes. 4. Gravitational Potential Energy Formula: U = - G (m₁m₂) / r Numerical problems include finding the potential energy between two masses due to gravity. 5. Orbital Motion and Satellites Formulas: v = √(GM/r) (Orbital velocity) T = 2π√(r³/GM) (Time period of satellite) Questions involve calculating orbital speed, time period, and escape velocity. Key Tips for Solving Gravitation Numericals Understand the Given Data: Read the problem carefully and extract values of mass, distance, and gravitational constant (G = 6.674 × 10⁻¹¹ N·m²/kg²). Use Correct Formulas: Identify the appropriate formula based on the type of question. Proper Units: Always use SI units (mass in kg, distance in meters, force in Newtons). Simplify and Calculate Carefully: Avoid calculation mistakes by breaking down the steps properly.