# Newton's law of universal gravitation: Quiz

Question 1: Every point mass attracts every single other point mass by a ________ pointing along the line intersecting both points.
EnergyForcePhysicsClassical mechanics

Question 2: ________ takes this as a basic principle.
Introduction to general relativityBlack holeGravitationGeneral relativity

Question 3: Newton's law has since been superseded by Einstein's theory of ________, but it continues to be used as an excellent approximation of the effects of gravity.
Black holeIntroduction to general relativityGeneral relativityGravitation

Question 4: Calculations using ________ are in much closer agreement with the astronomical observations.
GravitationGeneral relativityBlack holeIntroduction to general relativity

Question 5: In the limit, as the component point masses become "infinitely small", this entails ________ the force (in vector form, see below) over the extents of the two bodies.
Continuous functionCalculusIntegralDerivative

Question 6: Newton's Theory does not fully explain the precession of the perihelion of the ________ of the planets, especially of planet Mercury, which was detected long after the life of Newton.
OrbitLagrangian pointOrbital mechanicsOrbital elements

Question 7: (Separately it was shown that large spherically-symmetrical masses attract and are attracted as if all their mass were concentrated at their centers.) This is a general ________ derived from empirical observations by what Newton called induction.
Physical lawPhysicsScientific methodAristotle

Question 8: In situations where either dimensionless parameter is large, then ________ must be used to describe the system.
Black holeGeneral relativityGravitationIntroduction to general relativity

Question 9: Both are ________, in which force is inversely proportional to the square of the distance between the bodies.
Inverse-square lawLightSunEnergy

Question 10: The gravitational field is a ________ that describes the gravitational force which would be applied on an object in any given point in space, per unit mass.