G9-SCI-L9 Gravitation

What is the force of gravitation between two objects proportional to?

• The distance between them
• The product of their masses
• The square of the distance between them
• Both B and C

Why doesn't a heavy object fall faster than a light object?

• Because the force of gravity is weaker on heavy objects
• Because the force of gravity is stronger on heavy objects
• Because the acceleration due to gravity is the same for all objects
• Because the acceleration due to gravity is different for heavy and light objects

What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface?

• 9.8 N
• 10 N
• 6.7 × 10–11 N
• Depends on the distance between the earth and the object

Does the earth attract the moon with a force that is greater, smaller, or the same as the force with which the moon attracts the earth?

• Greater
• Smaller
• The same
• Depends on the distance between the earth and the moon

Why doesn't the earth move towards the moon?

• Because the moon is much smaller than the earth
• Because the moon is moving in a circular orbit around the earth
• Because the force of gravity between the earth and the moon is very weak
• Because the earth and the moon are at a constant distance from each other

What happens to the force between two objects if the distance between them is doubled and tripled?

• The force is doubled and tripled respectively
• The force is halved and one-third respectively
• The force is quadrupled and multiplied by nine respectively
• The force remains the same

What is the importance of the universal law of gravitation?

• It explains the motion of objects on the earth
• It explains the motion of objects in space
• It helps in designing ships and submarines
• All of the above

What is the acceleration of free fall?

• 9.8 m/s^2
• 10 m/s^2
• 6.7 × 10–11 m/s^2
• Depends on the mass of the object

What do we call the gravitational force between the earth and an object?

• Weight
• Mass
• Thrust
• Pressure

Why does a block of plastic released under water come up to the surface of water?

• Because the block is lighter than water
• Because the block is denser than water
• Because of the buoyant force exerted by the water
• Because of the gravitational force exerted by the earth