Let us discuss about a question related to Physics of class 9 Science book chapter gravitation if earth attract moon by gravitational force, then why moon do not move towards the earth? @jsuniltutorial.in Satellite of mass m1 orbiting Earth at an altitude r. The centripetal force experienced by the satellite is due to the gravitational force acting on it. When an object, like a satellite, is in a circular orbit, gravity is the only force acting on it, which means that the centripetal force must be equal to the gravitational force: FC = FG From this equation we can calculate the velocity that the satellite needs to stay in orbits around the Earth: FC = m v2/r = FG = G mM/r2 → v = sqrt (G M/r) where m is the mass of the satellite and M is the mass of the Earth. In short answer is: Centripetal force of moon and Gravitational pull of earth balance each other . Let us understand in detail : Gravity is a fundamental force that exists between all objects with mass. In the case of the Earth and the Moon, both exert gravitational forces on each other due to their masses. This gravitational attraction does indeed cause the Moon to move, but it also has a significant sideways motion. The Moon's motion is a result of a balance between its inertia (tendency to keep moving in a straight line) and the gravitational pull from Earth. While the Moon is being pulled toward Earth, it also has a considerable forward velocity. This combination of gravitational attraction and forward motion leads to the Moon continuously falling toward Earth but also constantly missing it. This motion results in the Moon's orbit around the Earth. In simpler terms, think of it like swinging a ball on a string. You're pulling the ball (like Earth's gravity), but you're also giving it enough sideways push (like the Moon's initial velocity) to keep it moving around you instead of crashing into you. This orbital motion is what keeps the Moon in a stable path around the Earth, without it falling directly onto the Earth's surface. It's like the Moon is in a continuous free fall, but its forward motion prevents it from getting closer and closer to Earth.
Notes For teacher: If you'd like to explain this concept to your students, you can use the analogy of a satellite orbiting Earth or a swinging pendulum. This way, they can visualize how the balance between gravitational attraction and motion prevents the Moon from falling to Earth. Remember, it's important to encourage your students to ask questions and explore further. This curiosity is a great way to nurture their understanding of scientific concepts. Let knowledge be the cure. If you have any more questions or need additional explanations, feel free to ask! Write down in comment box for more Question Class 09 Chapter Gravitation
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