Balanced Forces ```Name: pete Status: student Age: 15 Location: N/A Country: N/A Date: 1999 ``` Question: If a car accelerates because there is an balanced force acting on it how can it move if for every action there is an equal and opposite reaction? Replies: Unbalanced forces would be peculiar, indeed! Let us take two objects, say a horse and planet earth. The horse pushes backward against the earth, and the earth pushes the horse forward with exactly the same magnitude force. F horse = F earth mA = Ma In the horse-earth system, the large mass of the earth results in a small acceleration of the earth, where the small mass of the horse results in a large acceleration. ---Nathan A. Unterman Click here to return to the Physics Archives

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.

For assistance with NEWTON contact a System Operator (help@newton.dep.anl.gov), or at Argonne's Educational Programs