InterviewSolution
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InterviewSolution
| 1. |
Using free body diagram show that it is easy to pull an object than to push it |
| Answer» <html><body><p><<a href="https://interviewquestions.tuteehub.com/tag/p-588962" style="font-weight:bold;" target="_blank" title="Click to know more about P">P</a>></p>Solution :Whena bodyis pushedat anarbitraryangle `theta` thatvariesfrom `(p " to"(pi )/(2))` . TheappliedforceF canberesolvedintotwocomponentsas Fsin `theta` parallelto the surfaceand F cos `theta` prependicularto the <a href="https://interviewquestions.tuteehub.com/tag/surface-1235573" style="font-weight:bold;" target="_blank" title="Click to know more about SURFACE">SURFACE</a>. Thetotaldownwardforceactingon thebodymg +F cos `theta` . Itis impliedthat thenormalforceactingon thebodyincrease. sincethereis noaccelerationalongthe verticaldirectionthe normalforce N is given by <br/> As a resultthe maximalstaticfrictionalsoincreasesand thatis <a href="https://interviewquestions.tuteehub.com/tag/equal-446400" style="font-weight:bold;" target="_blank" title="Click to know more about EQUAL">EQUAL</a> to <br/> `f_(s) ^(<a href="https://interviewquestions.tuteehub.com/tag/max-546895" style="font-weight:bold;" target="_blank" title="Click to know more about MAX">MAX</a>)= mu_(s)N_(push)` <br/> `-mu_(s ) (mg + F cos theta)` <br/> Equationshows thata greaterforceneedstobe appliedto pushthe objectintomotion<br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PRE_GRG_PHY_XI_V02_C03_E01_020_S01.png" width="80%"/><br/> Whenan <a href="https://interviewquestions.tuteehub.com/tag/objectis-1127367" style="font-weight:bold;" target="_blank" title="Click to know more about OBJECTIS">OBJECTIS</a> pulledat anangle `theta` the aplliedforceisresolvedinto twocomponents. The totaldownwardforceacting on theobject is<br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PRE_GRG_PHY_XI_V02_C03_E01_020_S02.png" width="80%"/> <br/> Equation (3)showsthat thenormal forceis less that `N_(push)`Fromequation `(1) ` and (3)weknowthat itis easier to pullan objectthattopushto makeit move.</body></html> | |