Gravitation - 01 - Class 9

According to Newton's law of gravitation, the Earth and the Moon are gravitationally attracted to each other. The more massive Earth attracts the Moon with...

• a stronger force than the Moon attracts the Earth.

• a weaker force than the Moon attracts the Earth.

• the same force as the Moon attracts the Earth.

• a force that is sometimes stronger and other times weaker than the Moon attracts the Earth.

Which of the following best explains why a person has less weight on top of a mountain?

• They are closer to space.

• The atmosphere is lighter.

• The mountain adds more mass.

• The mountain adds more distance.

The picture shows three objects gravitationally interacting with each other. Which object exerts the greatest force on object B?

• Object A

• Object C

• A and C exert an equal force on B

• Cannot be determined

A massive object and a less massive object exert a gravitational force on each other. Which of the following picture correctly shows the magnitude and direction of the forces involved in this interaction?

• 
• 
• 
• 

The gravitational force in the previous interaction was 20 N. Determine the gravitational force in the new situation where the second mass is doubled.

• 10 N

• 20 N

• 40 N

• 80 N

The distance between the two masses in the previous situation is halved. Determine the gravitational force in this new situation.

• 20 N

• 40 N

• 80 N

• 160 N

The figure shows the gravitational field surrounding the Earth. Which of the following explains why the field lines point towards the Earth?

• Gravity is an attractive force.

• The force of gravity points towards the center of the Earth.

• Falling bodies accelerate towards the center of the Earth.

• All of the above.

Which of the following statements is correct with respect to G and g?

• G is a fundamental constant, whereas g is a physical quantity and subject to change.

• Both G and g can change, but g can only change if you go to a different planet.

• G and g are both constant, but g is determined by the mass and radius of the Earth.

• The strength of G is determined by g.

The surface gravity on Earth is approximately 10 N/kg. What would the surface gravity be if the Earth contained twice as much mass?

• 5 N/kg

• 10 N/kg

• 20 N/kg

• 40 N/kg

Suppose an exoplanet is found that has the same mass as the Earth, but is slightly larger than the Earth. What would be the surface gravity on this planet?

• less than 10 N/kg

• equal to 10 N/kg

• more than 10 N/kg

• cannot be determined