1. Acceleration:
* Direction: Gravity always pulls objects towards the center of the Earth (or any other massive object). This means that it causes objects to accelerate downwards.
* Magnitude: The acceleration due to gravity is constant near the Earth's surface (approximately 9.8 m/s²). This means that every second, an object's downward velocity increases by 9.8 meters per second.
2. Trajectory:
* Projectiles: Objects thrown horizontally or at an angle will follow a curved path due to the downward pull of gravity. This is why a ball thrown across a field follows an arc, not a straight line.
* Orbiting Objects: Objects in orbit around the Earth, like satellites, are constantly falling towards the Earth due to gravity. However, their horizontal velocity is so great that they continuously miss the Earth, resulting in a circular or elliptical path.
3. Changes in Speed:
* Falling Objects: Gravity causes falling objects to accelerate, increasing their speed as they fall.
* Objects Thrown Upwards: Gravity slows down objects thrown upwards until they momentarily stop at their highest point, then gravity pulls them back down, accelerating them downwards again.
4. Tides:
* Gravity from the Moon and Sun pulls on the Earth's oceans, creating tides. The Moon's gravitational pull is stronger than the Sun's due to its closer proximity to Earth.
5. Universal Gravitation:
* Every object in the universe exerts a gravitational force on every other object. This force is weaker for smaller objects or objects further apart, but it is always present.
In summary, gravity affects the motion of objects by:
* Accelerating them towards the center of a massive object.
* Changing their trajectory to follow a curved path.
* Changing their speed, either increasing it when falling or decreasing it when moving upwards.
* Creating tides and other gravitational phenomena.
It's important to note that gravity is a fundamental force and its effects are constantly present, even when not immediately noticeable.
