Bell Ringer: What is gravity?
We discussed gravity and how all objects have gravity. The earth is large so it has a stronger gravitational pull than a smaller object such as your desk. Tides are caused by the gravitational pull of the moon. We compared gravity to a trampoline. When a heavy object is on a trampoline other objects on the trampoline are drawn towards it. Gravity works this way except it pulls in all directions. Gravity is determined by the mass of an object and the distance. We then discussed the difference between mass and weight. Mass is the amount of matter and weight is the amount of gravitational pull on an object. You weigh less on the moon because their is less gravitational pull, but your mass remains the same. Check out the following website to see how much you would weigh on all the planets http://www.exploratorium.edu/ronh/weight/index.html. We then talked about how humans have worked to fight against gravity and we built bridges using straws and pins. The group with the strongest bridge won treats! A4 had two groups who built bridges that could hold 1000 pennies each! Make-up work: bell ringer
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