Lesson: Free Fall and Weightlessness High School Physics

Physics

In this lesson, we will learn how to describe the motion of objects acted on only by a constant gravitational force, moving only parallel to the force.

Worksheet

Q1:

Two objects, object I and object II, are both 75 m above the surface of the Moon, where the only force that acts on either of them is the gravitational force of the Moon. Neither object has any motion other than that due to its gravitational acceleration. Object I has a mass of 2.5 kg and object II has a mass of 6.5 kg.

What is the ratio of the mass of object I to the mass of object II?

What is the ratio of the gravitational force on object I to the gravitational force on object II?

What is the ratio of the acceleration toward the lunar surface of object I to the acceleration toward the lunar surface of object II?

Q2:

Two objects, object I and object II, are both 90 m above the surface of the Moon, where the only force that acts on either of them is the gravitational force of the Moon. Neither object has any motion other than that due to its gravitational acceleration. Object I and object II each have masses of 1.2 kg, and they both accelerate toward the lunar surface at 1.6 m/s2. Both objects are then elevated to a point 90 m above the lunar surface again and attached to each other to form a single compound object, and they are then released. What is the acceleration of the compound object toward the lunar surface when it is released?

Q3:

Two objects, object I and object II, are both 120 m above the surface of the Moon, where the only force that acts on either of them is the gravitational force of the Moon. Neither object has any motion other than that due to its gravitational acceleration. Object I and object II each have masses of 1.5 kg.

What is the ratio of the mass of object I to the mass of object II?

What is the ratio of the gravitational force on object I to the gravitational force on object II?

What is the ratio of the acceleration toward the lunar surface of object I to the acceleration toward the lunar surface of object II?

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