Tagged: forces


July 31, 2020 at 1:47 pmkremellaAdministratorWhy does the total sum of forces acting on a system always have to be equal to zero?

July 31, 2020 at 1:48 pmKeyur KanadeAnsys Employee
Hi!
The total sum of forces acting on a system is equal to zero only if it is not accelerating i.e. it is in a static equilibrium. This is a consequence of the conservation of linear momentum law.

July 31, 2020 at 1:48 pmkremellaAdministratorThank you for the answer. Could you please explain what linear momentum is? And how does it lead to the condition that when a body is in static equilibrium the sum total of all forces acting on it should be zero?

July 31, 2020 at 1:48 pmKeyur KanadeAnsys EmployeeThe linear momentum is defined as p=mv, where p is the linear momentum, m is the system mass, and v is the velocity. We can have conservation of linear momentum as long as the linear momentum stays constant in time. If you differentiate both sides of the above equation wrt time you would get dp/dt = m*dv/dt = m*a. Since dp/dt=0 for an isolated system for the momentum to be conserved, then m*a=force=0 i.e. net force on an isolated system has to be equal to 0.

 You must be logged in to reply to this topic.
Simulation World 2022
Check out more than 70 different sessions now available on demand. Get inspired as you hear from visionary companies, leading researchers and educators from around the globe on a variety of topics from lifesaving improvements in healthcare, to bold new realities of space travel. Take a leap of certainty and check out a session today here.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Ansys Blog
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
 What is the difference between internal and external flows?
 How do you define specific gravity? What is its significance???
 Why is it much easier to roll a log than drag a wood cube with the same mass?
 Why ice floats on water
 How to gain research experience?
 Archimedes principle
 Cell Counting?
 What is the surface tension of a fluid?
 Characteristic impedance of transmission lines
 Sonic boom

613

562

220

188

128
© 2022 Copyright ANSYS, Inc. All rights reserved.