The discussion focuses on calculating the normal forces acting on a crate and a person standing on it. The crate has a mass of 41 kg and the person has a mass of 67 kg. The correct calculations for the normal force exerted by the floor on the crate is 1080 N, assuming gravitational acceleration is approximated to 10 m/s². The normal force exerted by the crate on the person is 670 N. It is emphasized that using the precise value of gravitational acceleration (9.8 m/s²) will yield more accurate results.
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You should always specify units (unless instructed otherwise).Pizza Dave said:a. 1080
b. 670
Both values are just approximations. Often students are told to use 10 ms-2. On the other hand, if it is approximated to 10 then, logically, the answers should only be given to the same precision, e.g. 1100 N for (a).carl_loves_math said:it looks like you substituted 10 for the force of gravity instead of the actual value of 9.8.