🌍Down is the direction of gravity, pulling everything towards the center of the Earth.
🔄Objects fall because they are following a straight path, known as a geodesic, on a curved surface.
🌐Gravity is not a force, but the result of curvature in space-time.
🛰️The Equator and lines of latitude on a sphere are not geodesics, as they contain curves and turns.
⚖️Mass is an intrinsic property of an object, while weight depends on the gravitational force acting on it.
Why do objects fall?
—Objects fall because they are moving along a straight path, known as a geodesic, on a curved surface.
What is the difference between mass and weight?
—Mass is an intrinsic property of an object and does not change, while weight depends on the gravitational force acting on the object.
Is gravity a force?
—No, gravity is the result of the curvature of space-time and is not considered a force.
Why do objects weigh less on the Moon?
—Objects weigh less on the Moon because it has less mass and therefore exerts less gravitational force compared to the Earth.
Why do lines of latitude on a sphere not follow a straight path?
—Lines of latitude on a sphere contain curves and turns and are not considered geodesics, which are straight paths on curved surfaces.
00:00The concept of gravity and the direction of down depend on an individual's perspective.
08:12Weight is the force of gravity acting on an object, and it depends on the object's mass and the strength of the gravitational field.
11:30The direction of down is always changing due to factors such as mass distribution and Earth's spin.
14:56Objects fall because they are moving along straight paths, known as geodesics, on curved surfaces.
17:06Curvature is the reason why objects appear to fall together, even though no external force is acting on them.
20:49Gravity is the result of curvature in space-time, and it is not considered a force.
