Sum

Two spherical balls of mass 10 kg each are placed 10 cm apart. Find the gravitational force of attraction between them.

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#### Solution

The gravitational force of attraction between the balls is given as by

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

\[\text { Given } : m_1 = m_2 = 10 kg \text { and } r = 10 cm = 0 . 10 m\]

\[\therefore F = \frac{6 . 67 \times {10}^{- 11} \times 10 \times 10}{\left( 0 . 1 \right)^2}\]

\[ \Rightarrow F = 6 . 67 \times {10}^{- 7} N\]

Concept: Universal Law of Gravitation

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