the concept of force n.
Skip this Video
Loading SlideShow in 5 Seconds..
The concept of force PowerPoint Presentation
Download Presentation
The concept of force

Loading in 2 Seconds...

play fullscreen
1 / 13

The concept of force - PowerPoint PPT Presentation

  • Uploaded on

The concept of force. By the end of this topic you should be able to : state the difference between mass and weight ; draw vectors representing forces acting on a given body ; identify situations in which frictional forces develop and draw those frictional forces ;

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'The concept of force' - cala

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
the concept of force

The concept of force

Bytheend of thistopicyoushouldbeableto:

statethedifferencebetweenmass and weight;

drawvectorsrepresentingforcesactingon a givenbody;

identifysituations in whichfrictionalforcesdevelop and drawthosefrictionalforces;

use Hooke’slawcorrectly.



Why do objectsmovelikethey do?


Thisforceistheresult of thegravitationalattractionbetweenthemass in question and themass of theearth. Theweight of a bodyisthegravitationalforceexperiencedbythatbody, whichonearthisgivenbythe formula

W = mg


A stringthatistautissaidto be undertension. Theforcethatarises in anybodywhenitisstretchediscalledtension. A tensionforce in a stringiscreatedwhentwoforces are applied in oppositedirections at theends of thestring.

Tosaythatthereistension in a stringmeansthatanarbitrarypointonthestringisacteduponbytwoforces (thetension T).

normal reaction forces
Normal reactionforces

If a bodytouchesanotherbody, thereis a force of reactionorcontactforcebetweenthetwobodies. Thisforceis perpendicular tothebodyexertingtheforce.

drag forces

Dragforces are forcesthatopposethemotion of a bodythrough a fluid (a gas or a liquid).


Anyobject placed in a fluid experiencesanupwardforcecalledupthrust. Iftheupthrustforceequalstheweight of thebody, thebodywillfloat in the fluid. Iftheupthrustislessthantheweight, thebodywillsink.


Frictionalforcesopposethemotion of a body. Frictionariseswheneveronebodyslidesoveranother. In this case wespeak of kineticfriction. Frictionalsoariseswheneverthereisjust a tendencyformotion, notnecessarilymotionitself. In this case, wespeak of staticfriction.

free body diagrams

A free-bodydiagramis a diagramshowingthemagnitude and direction of alltheforcesactingon a chosenbody. Thebodyisshownonitsown, free of itssurroundings and of anyotherbodiesitmay be in contactwith.

hooke s law

Ifwe try toextend a spring, a forcepullsthespring back toits original length; ifwe try tocompress a spring, again a force tries topullthespring back toits original length. Theforce in thespring has a simple relationshiptotheamountbywhichthespringis extended orcompressed.

T = k

Theextensionorcompression of thespringmustnot be toolarge, otherwiseHooke’slawisn’tapplicable. Thatrangeiscalled as theelasticlimit.