This week in science we started learning about forces of motion and dynamics. We started by learning how to make a force diagram. To make a force diagram you have to draw a dot to represent the object and then one arrow coming out of the dot and pointing up. Then you have to make one coming down and pointing down. Label the down arrow Force of the Earth on (object). Then label the up arrow the Force of (other source exerting force)on (object). Sometimes there is more then arrrow because sometimes there only the earth is exerting force on the object. Sometimes there are more arrows because there are multiple forces.

We also observed the difference of holding a basketball and a bowling ball. To hold up the bowling ball we have to push up more then we have to when we hold the basketball. It is harder to hold up the bowling ball because it exerts a bigger force on out hands.

We also learned what units we use to tell how great the force is. These are call Newtons. Then we learned how to use them in a number sentence. If I was holding the bowling ball then it might be exerting 10N (Newtons) on my hand and the earth would also be exerting 10N. Then number sentence would be 10N+(-10n)=0N.