Question

Which change will cause the gravitational force between a baseball and a soccer ball to increase ? Check all that apply

Moving the balls closer together

Moving the balls further apart

Wrapping the soccer ball in layers of duct tape

Using a baseball with a thinner leather removing the outer layer of the baseball

Putting the baseball in a plastic case

Answer 1

moving the balls closer together pumping more air into the soccer ball putting the baseball in a plastic case 

Answer 2

Explanation :

We know that the gravitational force between two objects is given by :

`F=G(m_1m_2)/(r^2)`

where,

G is universal gravitational constant.

`m_1` and
`m_2` are the masses of two objects.

r is the distance between them

i.e.
`F\propto m_1m_2`

and
`F\propto (1)/(r^2)`

So, the correct options are :

(1) Moving the balls closer together. The distance decreases and force increases.

(3) Wrapping the soccer ball in layers of duct tape will also increase force because the mass will increase.

(5) Similarly, putting the baseball in a plastic case will increase mass and hence force increases.