Gravitaion

What is the force that keeps the moon in orbit around the Earth?

• Centrifugal force

• Frictional force

• Gravitational force

• Magnetic force

According to the universal law of gravitation, the force between two objects is proportional to what?

• The sum of their masses

• The product of their masses

• The difference of their masses

• The square of their masses

What is the value of acceleration due to gravity on the surface of the Earth?

• 9.0 m/s²

• 8.5 m/s²

• 10 m/s²

• 9.8 m/s²

What is the term for the force that acts towards the center of a circular path?

• Centrifugal force

• Frictional force

• Centripetal force

• Gravitational force

Who formulated the universal law of gravitation?

• Albert Einstein

• Isaac Newton

• Galileo Galilei

• Johannes Kepler

What is the SI unit of gravitational force?

• Pascal

• Newton

• Joule

• Watt

What is the gravitational force between two objects dependent on?

• Their temperature and mass

• Their volume and mass

• Their masses and distance

• Their distance and speed

The gravitational force between two bodies of masses m1 and m2 separated by distance r is F. State the effect on the gravitational force when m1 increases twice.

• 2F

• 1/2 F

• 4F

• 4F

The value of Universal Gravitational constant is

• 6.673X10^-11 Nm^-2kg²

• 6.673X10^-11 Nm²kg²

• 6.673X10^-11 Nm² kg^-2

• 6.673 x10^-11 N m^-2 kg^-2

The reason why ocean tides happen is

• Electrical forces between the sun and the moon

• gravitational forces between the Earth and the moon.

• Magnetic forces between the Earth and the moon

• Motion of the moon around the earth