
https://www.questionsolutions.com/wp-content/uploads/2017/02/scale1.png
https://www.questionsolutions.com/wp-content/uploads/2017/02/scale2.png
Image from: F. P. Beer, R. E. Johnston, and P. J. Cornwell, Vector mechanics for engineers: Dynamics, 11th ed. New York, NY, United States: McGraw-Hill Inc.,US, 2015.