- Gravity is a kind of force
- Gravity causes objects that have mass / substances to be pulled down / to fall on a planet
- A pencil is a kind of object
- Hence, gravity is the force that causes the pencial to be pulled down on a planet

Hence, gravity is the force that causes the pencial to be pulled down on a planet
[Question]A pencil falls off of a desk. What moves the pencil toward the floor?
[Context]- Gravity is a kind of force 
- Gravity causes objects that have mass / substances to be pulled down / to fall on a planet 
- A pencil is a kind of object