What is the force of gravitational attraction between a man (mass 70 kg) and the Earth?

1 Answer
Junaid Mirza
May 12, 2018

#"686 N"#

Explanation:

Gravitational force of attraction between Earth and man is

#"F" = "GMm"/"d"^2 color(white)(...) ……[1]#

Where

  • #"G ="# Universal gravitational constant
  • #"M ="# Mass of Earth
  • #"m ="# Mass of man
  • #"d ="# Distance between centres of man and Earth

Acceleration due to gravity of earth is

#"g" = "GM"/"d"^2 color(white)(...) ……[2]#

Value of #"g"# on surface of earth (#"d = R"#) is approximately #"9.8 m/s"^2#

On combining equations #[1]# and #[2]# we get

#"F = mg"#

#"F = 70 kg × 9.8 m/s"^2 = "686 N"#

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