# Help with beginner level physics word problem

1.The semester just started and my teacher has assigned us this question: How high of a tower could you build from the people in this class(30 people)? Include diagram. How much force would be pushing down on one of the base person's legs?

2. Note : Fg = mg

I created a triangular shape(human pyramid) with 7 people on bottom then 6,5,4,3,2,1,1,1 <- the 1's are on each other shoulders. So far I have calculated the approximate height if the bottom 6 rows are on their hands and knees and if the top 3 are standing up.

The next part is what I need help with. How would I start calculating the force pushing down? I assumed the 2nd row pushing down on the guy at the base would be 2 halves (weight distributed evenly) and so on. I also assumed the height and weight would decrease as the tower went up. I know the force of gravity is 9.8 but how would I use that and Fg = mg in this situation?

I hope you can understand this and help me as I am really confused right now D:

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SteamKing
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The next part is what I need help with. How would I start calculating the force pushing down? I assumed the 2nd row pushing down on the guy at the base would be 2 halves (weight distributed evenly) and so on. I also assumed the height and weight would decrease as the tower went up. I know the force of gravity is 9.8 but how would I use that and Fg = mg in this situation?

I hope you can understand this and help me as I am really confused right now D:
I don't know where you got the equation Fg = mg.

The weight of a person is calculated using W = mg, where m is the mass of a person in kg, g is the acceleration due to gravity, 9.81 m/s2, and W is the weight in newtons, the SI unit of force.

For example, if someone has a mass of 50 kg, his weight is 50 * 9.81 = 490.5 Newtons. That's a force of 245.25 Newtons on each leg.

To find out the force acting on each row, add up the mass of all the people standing on the rows above.

haruspex