Today in Honors Physics we began by white boarding problems #4 and #5 from the Free Particle Model Worksheet 2: Interactions. After discussing #4, we discussed a situation where Mr. Dickie is holding a bowling ball. Normally, we do not notice the effects of gravity while standing still. When on a swing, we feel the effects of gravity when we hit the ground. With just the bowling ball, earth is pulling on the bowling ball through gravity with 66 N. Mr. Dickie was holding the ball, thus exerting 66N of normal force on the ball in order to hold it up.Overall (demonstrated by the force diagram on the right), the floor pushes up on both, so one arrow is used to represent it. The floor, through normal force, acts on Mr. Dickie with 792 N and 66 N on the bowling ball. Two arrows are used downward because in addition to the gravity of the earth on Mr. Dickie with 792 N, the normal force of the bowling ball acting on Mr. Dickie is 66N.
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