Physics in CARTOONS!!!

It might seem weird to look to the world of cartoons to learn about the physical laws that govern the world, but sometimes cartoons get physics right!

This scene from "Toy Story 3". In this scene, Woody hangs from a tree, caught by his pull string. Then the string retracts, activating his built-in voice recording. The physics here is fairly straightforward, we are measuring the net forces at work on Woody to see how and if he moves.
At first, Woody is falling, accelerating toward the ground due to gravity. The string gets caught on tree, so now we get tension force of the string is pulling Woody up. For a second, the tension force is equal to the gravitational force, so Woody hangs motionless. The net forces acting o him are in balance. Then some mechanism in Woody activates, the spring applies extra tension force to the string (we can treat the spring as part of Woody). This increase in tension force exceeds the gravitational force, so Woody begins accelerating upward.

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