Nora tied a string around a tennis ball, and then she swung it in a circle in front of her to demonstrate a planet orbiting the Sun. She explained that her hand represented the Sun, the ball represented a planet, and the string kept the ball from leaving the "orbit" around her hand.
Why doesn't the string work in the same way as gravity?
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1 answer
The string is an external force that is physically holding the ball in its orbit, whereas gravity is an intrinsic force that naturally keeps planets in orbit around the Sun. The string's tension is not the same as the gravitational force that planets feel from the Sun.
1 answer