Page 36 - Force 10
P. 36
NUMERICAL INVOLVING UNIVERSAL LAW
Q.1.) Calculate the gravitational force in between two objects of mass 25 kg and 20 kg if
distance between them is 5 m.
25 kg 20 kg
st
Ans:let the mass of 1 object ( m ) = 25 kg,
1
nd
the mass of 2 object (m ) = 20 kg,
2
distance between their centres (d) = 5 m. 5 m
× 2
1
According to the Newton’s law of gravitation: F = G A B
2
6.67×10 −11 ×25×20
=
(5) 2
6.67×10 −11 ×25×20
=
25
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∴ F = 1.33 × 10 −9 N
Hence, the gravitational force between two object is 1.33 × 10 −9 N.
