Application of Newton's Laws
FORCE AND WEIGHT
FORCE AND WEIGHT
Force can be thought of simply as a push or pull, but is more clearly defined as
any action on a body that tends to change the velocity of the body. Weight is a
force exerted on an object due to the object's position in a gravitational field.
DEFINE the following:
In the study of forces, the student must make valid assumptions called for in the formulation of
real problems. The ability to understand and make use of the correct assumptions in the
formulation and solution of engineering problems is certainly one of the most important abilities
of a successful operator. One of the objectives of this manual is to provide an opportunity to
develop this ability through the study of the fundamentals and the analysis of practical problems.
An effective method of attack on all engineering problems is essential. The development of good
habits in formulating problems and in representing their solutions will prove to be a valuable asset.
Each solution should proceed with a logical sequence of steps from hypothesis to conclusion, and
its representation should include a clear statement of the following parts, each clearly
defined: a) given data, b) results desired, c) necessary diagrams, d) calculations, and e) answers
and conclusions. Many problems become clear and straightforward once they are begun with a
logical and disciplined method of attack.
In addition, it is important to incorporate a series of checks on the calculations at intermediate
points in the solution. Also, all work must be neat and orderly.
The subject of classical physics is based on surprisingly few fundamental concepts and involves
mainly the application of these basic relations to a variety of situations. Newton's laws of motion
are some of the fundamental concepts used in the study of force and weight.