What is the force of gravity between two 1000 kg cars separated by a distance of 20 m on a highway? 3. Using the force, calculated in # 2 above, and the weight of the car, calculate: Force (from #2) divided by the weight of car

Force of attraction between two masses M and m at distance d

= G mM / d² where G is universal gravitational constant.

Force of attraction between two cars of masses 1000kg each

= 6.67 x 10⁻¹¹ x 1000 x1000 / 20²

= 1.6675 x 10⁻⁷ N

Weight of car

mg

1000 x 9.8

= 9.8 x 10³ N

Ratio = force / weight of car

= 1.6675 x 10⁻⁷ / 9.8 x 10³

=.17 x 10⁻¹⁰

17 x 10⁻¹²