Answer:

I know that I know something about gravity and friction. First, gravity is what holds everything in space and it is the force that attracts a body toward the center of the earth. While friction is a force, parallel to the contact surface, that opposes motion between two objects.

In addition gravity is also the reason why we don't float and friction prevents us sometimes from sliding.

Finally, gravity and friction are both kind of force. Friction depends directly on the normal force and consequently on the force of gravity.

Now you know something that I know about how gravity and friction are related.