This week during Science I learned more about forces. i learned that the earth applies more force on a heavier object, but when you drop the two they hit the ground at the same time. We also talked more about the greater the force that you have the greater the acceleration of an object. And the less the mass the greater the acceleration. I also learned that when two forces are balanced, there is no acceleration. The object is either not moving or moving at a steady rate. An object is always moving at a steady rate, even if it is a steady rate of 0 miles per hour or meters per second. We also talked a lot about friction and what a world without friction would be like. You would not be able to stop driving or to stop sliding unless you crashed. You would not even be able to start running because in order to start you have to use friction to push your feet off the ground. We learned about Newton's Third Law. When Kathy pushed on Laura and they were on carts, Laura and Kathy both moved. We also tested this on springs. What we learned from this was that even if an object is not pushing back, it is pushing back and that every object returns the same amount of force that is pushed against it.
I learned this by doing the spring experiment, the Laura and Kathy experiment, and dropping two thing while standing on a counter.
It is important to know these things because if you do not know Newton's three laws then you will not understand how an object starts to move, how it keeps moving, and how other objects effect the way he moves.
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