Unformatted text preview: Unit 3 Problem Set Key
Ranking Tasks Section:
I wo asteroids with masses of w and 3m exert gravitational forces on each other. A student contends that the forces
will be in different directions and of different magnitudes as shown below.
What's wrong. if anything, with this student's contention? If something is wrong. identify it and explain how
to correct it. If this student's contention is correct. explain why.
Answer: The forces are attractive so the directions should be reversed and the forces should be equal as required
by Newton's Third Law.
Three objects each with a mass of M exert gravitational forces on each other, Which of the
arrows below shows the direction of the net force on mass IT
(v) None of these
Explain your reasoning
Answer (a) vector addition of the force ou B by A (which is directed horizontally to the left) and the force on $ by
C (which is directed toward the bottom of the page or down) results in a force 45" down to the left
Object A has twice the mass of Object B.
Identify the pair of force vectors (the arrows) that correctly compare the gravitational
force exerted on A by B with the gravitational force exerted on B by A.
Gravitational force on A by B Gravitational force on B by A
Explain your reasoning.
The forces must be attractive, because the gravitational force is always an attractive force. Newton's Third Law
requires that the magnitude of the forces be the same....
View Full Document
- Fall '18