* Velocity is a measure of how fast an object is moving and in what direction. It's a vector quantity, meaning it has both magnitude (speed) and direction.

* Acceleration is a measure of how quickly an object's velocity is changing. It's also a vector quantity.

Gravity is a force. It's an invisible force that pulls objects towards each other.

Here's how gravity relates to velocity and acceleration:

* Gravity causes acceleration. When you drop an object, gravity pulls it towards the Earth, causing it to accelerate downwards. This means its velocity increases over time.

* Gravity can influence an object's velocity. If an object is already moving, gravity can alter its velocity. For example, a ball thrown horizontally will be pulled downwards by gravity, changing its trajectory.

In summary:

* Gravity is a force.

* Gravity causes acceleration.

* Gravity can influence an object's velocity.