Imagine you’re wearing socks in your house and you slip over. If you’re on a smooth, tiled floor you don’t have any grip and will fall over. If you’re in a carpeted room, you’ll have better grip. This grip between your socks and the carpet is called ‘friction’.
Although walls seem pretty smooth, they are still a slightly rough surface in comparison to the inside of your bath. The spiders feet won’t have any grip and therefore the spider will find it harder to climb out. This is because there is no friction between the spiders legs and the bathtub.
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