{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

U4Rdng-forcedgrm - UNIT IV Reading Force Diagrams The...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
UNIT IV: Reading - Force Diagrams The analysis of a problem in dynamics usually involves the selection and analysis of the relevant forces acting on some object under consideration. An important first step in this analysis process is to carefully select the object of interest that will be the focus of our analysis. For purposes of this analysis, we will refer to the object under consideration as the system, .and everything else in the environment that might in any significant way affect the system as the surroundings . This analysis process can often times be greatly simplified by utilizing a technique of constructing force diagrams to assists you in selecting the relevant forces and appropriately representing these forces with vector notations. For the purpose of developing a force diagram for problem analysis, all forces will be categorized as either contact or long range forces. Contact forces are all forces acting on the system under analysis that result from the contact between the system and its surroundings at the systems boundaries. These forces include forces of static and kinetic friction, tension forces and normal forces . Long range forces result from the systems interaction with a force fields of some kind, such as magnetic, electric,or gravitational fields. Consider, for example, the forces acting on a block being pulled along a horizontal table top by a string attached to the block, passing over a pulley, and terminating with several masses attached to the string by a mass hanger. (See Figure 1). Figure 1 Notice first that the block makes direct contact with both the surface that it is sliding over and with the string. The block, additionally, interacts with its surroundings by way of its interaction with the earth's gravitational field. As the block slides along the surface, there is one component of force resulting form the sliding action that acts parallel to the surface and in a direction opposite to the direction of motion (resists the sliding motion). This component of surface contact force is designated as the force of kinetic friction * . In addition to the parallel
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern