ثقل

Newton's law of gravitation says the force between two masses is proportional to:

• 1 The sum of the masses
• 2 The difference of the masses
• 3 The distance between them
• 4 The product of the masses

If the distance between two masses is doubled, the gravitational force becomes:

• 1 Four times
• 2 One quarter
• 3 Half
• 4 Double

The value of g near the surface of the Earth is about:

• 1 0.98 m/s2
• 2 98 m/s2
• 3 9.8 m/s2
• 4 6.67 m/s2

The acceleration due to gravity on the Moon compared with Earth is about:

• 1 Six times greater
• 2 Zero
• 3 One sixth
• 4 The same

A satellite stays in orbit around the Earth because:

• 1 It is very light
• 2 It has no weight
• 3 Gravity provides the centripetal force
• 4 There is no gravity in space

The mass of a body on the Moon compared with its mass on Earth is:

• 1 More
• 2 The same
• 3 Less
• 4 Zero