Explain · analogy · Like I'm five version
Gravity in terms of an over-friendly dog
Gravity is just like a big, over-friendly dog that really wants to give you a hug.
Think of the Earth as a giant ball that is always wagging its tail to say hello to everything nearby. This big dog pulls on your jumper with its paws to make sure you stay close. It does not want you to float away into space like a runaway balloon. Gravity is the invisible lead that keeps your feet stuck firmly on the garden grass.
This happy dog is always pulling at your shoes to keep you safe on the ground. It is why your favourite toy car rolls down the slide instead of flying up to the clouds. When you jump up high, the dog gently tugs you back down for a cuddle. It is very clingy, but it just loves to have you stay put for a game of fetch.
Even when you are asleep in bed, the dog is still leaning on you to keep you tucked in. It does not matter if you are a bouncy ball, a heavy book or a wiggly puppy, the pull is always there. You could try to jump to the moon, but the dog is far too excited to let you leave the front door. Gravity is simply the best friend who never wants to let you go.
Where the analogy breaks downA dog eventually stops pulling when it gets tired or distracted, but gravity never takes a break.