How Did David Do It?
David defeated Goliath by striking him on the forehead with a stone from a sling. How did David do it? He knew something about energy and the speed of the stone. The greater the energy, the greater the damage to the target (Goliath’s head). The greater the speed, the less likely Goliath would have been able to dodge the stone.
Centrifugal force is the force we experience when we sit in a car that goes around a corner. It’s the force that makes clothes cling to the bin of a washing machine in a spin cycle. One day centrifugal force could provide artificial gravity for spaceships and space stations. As David swung the stone in his sling, this is the force that pushed the stone away from the center of the circle.
Potential energy is the energy stored in an object because of its position or state. A bicycle on top of a hill, or a book held over your head, has potential energy. In the story of David and Goliath, before David released the stone in the sling, it built up a lot of potential energy.
If you hang on to Jesus, even if you’re upside down, you won’t fall, just like the stone stayed in the sling when it was going round and round.
Kinetic energy is the energy an object has because of its motion. When David released the stone from his sling, the potential energy changed into kinetic energy, giving the stone its speed.
Reading the Bible and talking to Jesus is like building up the potential energy we need throughout the day. That special relationship is the power we need to be victorious. Think about David and the science behind his sling, and remember that Jesus is the power behind us in all we do!