Vsauce - Which Way Is Down?

If the sun were magically collapsed into a black hole and its mass stayed the same, which of the following would happen to the motion of the other planets?

• The planets would be pulled into the black hole.

• The planets would loose their orbits and begin to leave the solar system.

• The planets' orbits would stay the same.

Which of the following is the main reason for the steel ball to be more difficult to move than the plastic ball?

• it has more mass

• it has more weight

• there is more friction between the steel ball than the surface it's on

Why is it more difficult to stop the steel ball than the plastic ball when it's already in motion?

• the steel ball has more mass.

• the steel ball has more weight.

• there is more friction between the steel ball and the surface it's on.

The average of gravitational attraction between actions is between the objects'

• centers.

• surfaces away from each other.

• surfaces near each other.

If two baseballs were set motionless in outer space a meter apart from each other, what would eventually happen?

• they would remain in place

• they would eventually move away from each other

• they would move towards each other until they made contact over the course of about 3 days

• they would move towards each other until they made contact within a span of a few seconds

Which of the following increases the gravitational force between two objects?

• increasing the mass of at least one object

• increasing the distance between the objects

• decreasing the mass of at least one object

• decreasing the distance between the objects

Which of the following statements is true in regards to the force(s) of gravity between the Earth and an object over the Earth's surface?

• The Earth pulls on the object with a greater gravitational force than the object pulls on Earth. The object accelerates a lot more because of the difference in forces.

• The Earth pulls on the object with an equal amount of gravitational force as the object pulls on Earth. Both objects accelerate with the same magnitude.

• The Earth pulls on the object with an equal amount of gravitational force as the object pulls on Earth. The object accelerates a lot more because it has a lot less mass.

• The Earth pulls on the object with a weaker gravitational force than the object pulls on Earth. The object accelerates a lot more because of the difference in forces.

Why do astronauts in the ISS appear to be in zero gravity?

• They don't have weight, mg

• They don't have apparent weight, Fn

• They don't have mass, m

Balloons float by a buoyant force. What causes this buoyant force?

• mg being up

• Fn being greater than mg

• air molecule collisions below the balloon happening more frequently because gravity pulls harder on the lower air molecules

• air molecule collisions above the balloon happening more frequently because gravity pulls harder on the higher air molecules

Earth is wider at the equator than at the poles; the equator is further away from Earth's center. This means that if you're at the equator, you will feel

• heavier than you would anywhere else on Earth at sea level.

• lighter than you would anywhere else on Earth at sea level.

• exactly the same as you would anywhere else on Earth at sea level.