Multiple Choice
A toy truck is at rest on the floor. Which statement best describes the forces acting on the toy truck?
13
views
6. Intro to Forces (Dynamics)
Types Of Forces & Free Body Diagrams
Struggling with Physics?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In a free body diagram, if ball and ball are both charged with opposite signs and placed near each other, what is the nature of the force between balls and ?
A
The force is repulsive because opposite charges repel each other.
B
The force is attractive because opposite charges attract each other.
C
There is no force between balls and because they are not in contact.
D
The force is gravitational and always attractive, regardless of charge.
Verified step by step guidance1
Recall the fundamental principle of electrostatics: like charges repel each other, and opposite charges attract each other.
Identify the charges on balls C and D. Since they have opposite signs, one is positive and the other is negative.
Understand that the electrostatic force between two charged objects is given by Coulomb's law: \(F = k \frac{|q_1 q_2|}{r^2}\), where \(k\) is Coulomb's constant, \(q_1\) and \(q_2\) are the magnitudes of the charges, and \(r\) is the distance between them.
Since the charges are opposite, the force between balls C and D will be attractive, meaning they will pull towards each other.
Note that the force acts even if the balls are not in contact, as electrostatic forces act over a distance.
Related Videos
Related Practice
Types Of Forces & Free Body Diagrams practice set
Problem sets built by lead tutorsExpert video explanations