Log In Start studying!
Answers without the blur. Sign up and see all textbooks for free! Illustration


Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 332

Answers without the blur.

Just sign up for free and you're in.


Short Answer

A kg ball on the end of a lightweight rod is located at where the axis is vertical. The other end of the rod is attached to a pivot at . What is the torque about the pivot? Write your answer using unit vectors.

Hence, the torque applied on the mass is

See the step by step solution

Step by Step Solution

Step : 1 Introduction

The rotating equivalent of force is torque. It is provided by.

The force is , and the distance between the pivot and the site of application of force is .

The right-hand thumb rule determines the direction of torque, which is a vector quantity.

Step : 2 Explanation 

For the application of force, see the diagram below:

Step :3  Vector position 

The position vector of the mass is:

Substitute for and for

On the mass, the force vector is:

Here, and are the mass and acceleration of the ball, respectively.

Step : 4 Substituting 

Substitute for

The torque acting on mass is


Most popular questions for Physics Textbooks


Want to see more solutions like these?

Sign up for free to discover our expert answers
Get Started - It’s free

Recommended explanations on Physics Textbooks

94% of StudySmarter users get better grades.

Sign up for free
94% of StudySmarter users get better grades.