Universal Gravitation Conceptual

What is gravitational force?

• a force that attracts any object
• a force that pushes any object
• a force that shrinks any object
• a force that enlarges anyobject

Which of the following formulas is the correct equation for the law of Universal gravitation?

• $F=\frac{GM_1M_2}{d^2}$

• $F=mg$

• $F=\frac{Gd^2}{m_1m_2}$

• F= $F=\frac{KQ_1Q_2}{d^2}$

A moon is located at 1 unit out from the planet it orbits. If that moon was orbiting at 2 units out from the planet, how much would the gravitational force on the moon be compared to its distance at 1 unit?

• $\frac{1}{4}$ of the original force

• $\frac{1}{6}$ of the original force

• twice as much

• 4 times as much

A person on the Earth weighs 180 pounds. How much will they weigh on the moon? ( Note: The moons "g" is  $\frac{1}{6}$ times that of Earth)

• 30 lbs

• 360 lbs

• 0- you are weightless in space

• 18 lbs

If I double the mass of one object without changing anything else, What would happen to the gravitational force between that object and any other object?

• Doubles

• Quadruples

• Cut in Half

•  $\frac{1}{4}$  as much

What happens to Gravitational force if I double both of the masses but don't change their distance?

• doubles

• half as big

• 4 times bigger

• $\frac{1}{4}$ as much or 4 time smaller

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

I man who weighs 1000N on the surface of the earth will weigh how much at twice the distance in the atmosphere.

• 500 N

• 250 N

• 2000 N

• 4000N

At what point is the force of gravity on an object greatest

• At the center of the earth (Core of the earth)

• At twice the distance from the surface of the earth

• At the surface of the earth

• The force of gravity ios the same irrespective of distance from the center of the earth

How are mass and weight different?

• Mass is the amount of matter in an object;Weight is the amount of gravitational force acting on the object
• Mass is the amount of gravitational force acting on an object;Weight is the amount of matter in an object
• Mass is a thing;Weight is a place
• Mass is an animal;weight is a human