I know the rules say “don’t literally explain it as if it’s a 5-year-old” but in this case I truly think the “dumbest” you can make the answer, the better
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It’s the square-cube law. If you make a creature 10 times bigger it weighs 1000 times more (because its length, breadth and height all scale up). At the same time it gets 100 times stronger because strength scales with the cross section of bones and muscles. So the strength-to-weight ratio is now 10 times less and just standing up is now difficult and dangerous, and running is impossible.
So you can’t just scale up creatures and have them work the same. The square-cube law bites in many other ways like breathing, eating, staying cool, etc. That’s why elephants are so stockily built compared to smaller creatures. It also means that real giant humans like those in *Game of Thrones* and also tiny humans like those in *Ant Man* are completely impossible.
Ok, if there was a normal guy, and a giant, right, and they both wanted to take a step, they’d both do it the same way. The normal guy’s leg is like 3 feet long. The giant’s leg is 3 HUNDRED feet long. Even if the normal guy and the giant are basically the same strong, the giant has to move 300 feet of leg compared to the normal guy’s 3. So since the normal guy is only moving 3 feet, he can do that a bunch of times before the giant moves that 300 feet once.
There’s a lot of guesswork here. Not a fan.
The reason is actually fairly simple. A big thing moving the same speed as a small thing appears slower.
Think about a car driving in the distance.
Then another car, twice as big, driving next to it.
They drive at the same speed, but the big one takes longer to travel its own length, so it appears slower to you. Even at the same speed, it appears slower.
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Likewise, all objects fall at the same rate. This means that a bowling ball falling from ten feet will hit the ground way later than a pea falling from one foot. If dropped from the same height, they would in fact hit the ground together, but because the bowling ball is so large it would appear not to have fallen as far.
It all boils down to the good old parallax effect. Notice how when you’re going down the highway things that are closer seem to fly past you while things far away seem to move very slowly?
If you were close to said big things they would appear to move much faster but since they are big and dangerous you look at them from far away a distance so they look to be going slower.
Newton’s 2nd Law of Motion: F = ma
If you want to accelerate an object with mass m, it’s gonna require a force F. If you increase the mass of the object but want to still accelerate the object at the same rate, then you will have to increase the force applied.
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