Question

Due to Gravitational force _______:
1. We are attracted towards earth
2. Tide Occurs
3. Earth revolves around the sun
4. All of the above

Answer 1

Correct Answer - Option 4 : All of the above

The correct answer is All of the above.

• Due to gravitational force
  1. We are attracted towards the earth's centre
  2. Tide Occurs
  3. Earth revolves around the sun
• The gravitational force of attraction between a satellite and the earth gives rise to centripetal force.
  • Earth satellites are objects which revolve around the earth.
• Their motion is very similar to the motion of planets around the Sun and hence Kepler’s laws of planetary motion are equally applicable to them.
• In particular, their orbits around the earth are circular or elliptic.
• Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy including planets, stars, galaxies, and even light are attracted to one another.
• On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the tides of the oceans.
• The artificial satellites orbiting the Earth remain in their orbits and do not fall down due to the attraction of the Earth (gravity) which provides the necessary centripetal acceleration.

 

• Satellite is revolving around the earth
• Fg = Gravitational force of satellite towards the earth
• Fc = Centrifugal force on the satellite
• Fg = Fc makes Fnet = zero.
• Thus net force acting on the satellite is zero.
• When the body is inside a satellite, which is orbiting around the earth, the gravitational pull on the body due to earth is balanced by the centrifugal force on the body, due to which the effective weight of the body becomes zero.
• The force exerted by the satellite floor on the astronaut is equal to zero.
• He is not attracted by gravitational force.