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??
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
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.
Is this a common formula used
Yes, that is Newton's law of gravity
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.
The gravitational constant G = 6.67259 * 10^-11 Newton meters^2/kg^2
Mass of earth = 5.98 * 10^24 kilograms
radius of earth = 6.38 * 10^6 meters