JEE · Physics · Gravitation doubts

8 doubts found

All Physics Chemistry Maths

What does “Universal law of gravitation” actually mean in Gravitation, and why does it matter for JEE?

every two masses attract with F = G·m₁m₂/r² along the line joining them.

GravitationRead →

JEEPhysicsmedium

I keep getting “Universal law of gravitation” questions wrong in Gravitation. What's the trap?

forgetting the force depends on 1/r² — doubling the distance quarters the force.

GravitationRead →

What does “Acceleration due to gravity g” actually mean in Gravitation, and why does it matter for JEE?

g = GM/R² at a planet's surface; it decreases with both altitude and depth.

GravitationRead →

JEEPhysicsmedium

I keep getting “Acceleration due to gravity g” questions wrong in Gravitation. What's the trap?

treating g as a fixed 9.8 everywhere, including in orbit.

GravitationRead →

What does “Gravitational potential energy” actually mean in Gravitation, and why does it matter for JEE?

for large distances PE = −GMm/r (negative, zero at infinity), not mgh.

GravitationRead →

JEEPhysicsmedium

I keep getting “Gravitational potential energy” questions wrong in Gravitation. What's the trap?

using mgh far from the surface, where it no longer holds.

GravitationRead →

What does “Escape velocity” actually mean in Gravitation, and why does it matter for JEE?

the minimum speed to leave a planet's gravity, v = √(2GM/R) ≈ 11.2 km/s for Earth.

GravitationRead →

JEEPhysicsmedium

I keep getting “Escape velocity” questions wrong in Gravitation. What's the trap?

confusing it with orbital velocity.

GravitationRead →