- A ball is a kind of object
- Gravity pulls objects towards planets
- Gravity is a kind of force
- Hence, gravity is the force that pulls the ball towards the planet

So, gravity is the force that pulls the ball towards the planet
Question: Paco throws a ball. What force pulls the ball down toward the ground?
Context: - A ball is a kind of object 
- Gravity pulls objects towards planets 
- Gravity is a kind of force