Gravitation, Physics multiple choice question

2. Which of these follows from kepler’s laws of planetary motion?

1. All planets move in circular orbits

2. A satellite will slow down as it gets farther from the much more massive object it orbits.

3. Objects attract each other with a force proportional to the product of their masses.

4. Planets closer to the sun have lower orbital speeds.

3. Which of these was discovered by Newton?

1. The planets move in elliptical orbits around the sun

2. The earth orbits the sun, rather than the reverse

3. Gravity keeps the planets in their orbits

4. The acceleration caused by gravity is 9.8 m/s^2

12. What is a gravitational field?

1. The region of space-time where the force is equal to 6.67 x 10^-11 N

2. A relatively flat area on the earth such as the ocean surface

3. A region of space-time with a property at each point detemined as the gravitational force on any object divided by its mass m

4. The force of gravity between any two objects.