Explain · analogy
Gravity in terms of an over-friendly dog
Gravity is just a massive golden retriever that refuses to let go of your leg, even though you have absolutely nothing in your pockets for it.
The way mass works is quite simple, provided you view the universe as a dog park where the planet Earth is the size of a Great Dane and you are a particularly unwashed chew toy. The larger the object, the more aggressively it tries to lick your face and pin you to the floor, which is why you feel a firm gravitational tug in your trainers while the Moon just orbits at a polite, leash-straining distance. If you jump, you are basically just playing hard to get, and the Earth is going to drag you back down for a cuddle regardless of how much you complain about your dodgy knees.
Because all mass attracts, everything is constantly trying to pile into a heap, much like the cluster of confused terriers that forms whenever someone opens a packet of crisps at a village fete. Heavier items fall at the same rate as light ones because the dog doesn't care if you are a professional athlete or a bag of frozen peas, it is determined to catch you both at exactly the same speed. It makes life predictable, mostly by ensuring that your dropped toast always lands butter-side down, because the Earth is a needy pet that insists on being involved in your breakfast.
Even in orbit, you are still being pawed at, though astronauts are essentially just in a state of perpetual free-fall, like a dog that has jumped off the sofa and hasn't quite hit the carpet yet. It is a constant, suffocating, universal affection that prevents you from floating off into the void and ensures that your mobile phone stays firmly in the gutter where it belongs.
Where the analogy breaks downA dog eventually tires and goes for a nap, whereas gravity will continue to pin you down until the heat death of the universe.