Question

On which of the following objects, all sitting on the ground together, does
Earth exert a greater gravitational pull than your whole body? Check all that
apply.
O A. An elephant
B. A penny
C. A key
D. A truck
O
E. A bicycle

Answer 1

The gravitational force is stronger for

A) An elephant

D) A truck

Explanation:

The magnitude of the gravitational force between any two objects is given by  the equation:

$F=G\frac{m_1 m_2}{r^2}$

where :

$G=6.67\cdot 10^{-11} m^3 kg^{-1}s^{-2}$ is the gravitational constant

m1, m2 are the masses of the two objects

r is the separation between the objects

We see that the magnitude of the force of gravity is directly proportional to the product of the masses of the objects.

In this problem, we are comparing the gravitational force between you and the Earth with the gravitational force between the Earth and the objects mentioned: therefore, the second force will be greater when the mass of the object is larger than that of your body.

This condition is satisfied for the following objects:

A) An elephant

D) A truck

Since they are the only objects having a mass greater than you.

Learn more about gravitational force:

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