These are the answered multiple choice questions aboutthe forces in the Student and Backpack problem. Make a cleardiagram which properly identifies all of the forces acting on thestudent (you will also need a similar, separate, diagram for thebackpack), and then making the proper arguments leading to thecorrect answer.
(a) Which is stronger force, the force on the student bythe backpack or the force on the backpack by thestudent?
The two forces are equally strong by Newton's First Law.
(b) Which is the stronger force, the force on the backpackby the student or the weight of the backpack?
The two forces are equally strong by Newton's Third Law.
(c) Which is the stronger force, the force on the studentby the backpack or the weight of the backpack?
The force on the student by the backpack is stronger.The twoforces are equally strong by a combination of Newton's First Lawand Newton's Third Law.
(d) What kind of force is the force on the student by thebackpack?
An electromagnetic force.
(e) Which is the stronger force, the contact force on thestudent by the ground or the weight of the student?
The force on the student by the ground is stronger.
