Asked by me

Which one of the following objects will have the greatest force of gravity to the Earth at its surface

. A large book
B. A house

C. A human being

D. An average-size car
i don't get it??
Answered by Elina
Well I think that the question means which of the follwing objects will have the greatest force of weight to the earth at its surface. I think the answer is a house
Answered by Damon
F = G m Mearth / Radius earth^2
all the same for each object except m
so the biggest m gives the biggest gravitational force
Houses generally have more mass than even the largest cars.
Answered by Elina
Is this a common formula used
Answered by Damon
Yes, that is Newton's law of gravity
Answered by Damon
force between two masses equals Newton's gravitational constant times the product of the two masses divided by the square of the distance between them.
Answered by Damon
The gravitational constant G = 6.67259 * 10^-11 Newton meters^2/kg^2
Answered by Damon
Mass of earth = 5.98 * 10^24 kilograms
radius of earth = 6.38 * 10^6 meters
Answered by Elina
oh, i was just asking, because i really don't get any of this stuff
Answered by Damon
That is the famous one though, about the mythical apple falling on Newton's actual head and him coming up with the law of gravity as a result.
Answered by Elina
oh I heard about the one, but I can't remember but it was about a crown. By the way I'm only in grade 8, these things r way toooooo difficult 4 me
Answered by Damon
Well, your answer was correct anyway :)
Answered by Elina
yeah, I guess. :-\
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