Britain has promised to send an additional 500 troops to Afghanistan, bringing its force total to 9,500,second only to the United States.

VOA: standard.2009.11.17

You add them all up algebraically, keeping track of their sign, and that's the total force.

你再对这些力做代数加法,注意符号,就求出合力了

耶鲁公开课 - 基础物理课程节选

FT means the total force on a body.

T 表示物体所受的合力

耶鲁公开课 - 基础物理课程节选

"We have faced an enemy who do not want to fight us force-on-force, rather they wanted to lay improvised explosive devices to halt us in our path and this summer total of 1,800 Improvised explosive devices laid in our path, so we have had to adapt quickly."

VOA: standard.2009.10.12