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Date Posted: 05:38:08 02/12/00 Sat
Author: 仇老師
Author Host/IP: pcd014245.netvigator.com / 203.198.91.245
Subject: Re: About Friction!!!
In reply to: Topcon 's message, "About Friction!!!" on 05:21:20 02/12/00 Sat

一.當應用力(applied force)小於5N時,
  磨擦力(friction) = 應用力(applied force).
  淨力是零(Net force = applied force -friction = 0)
  跟據牛頓運動第一定律當淨力是零時,物件會保持原有狀態(在這裡即靜止)。

二.當應用力(applied force)等於5N時,
  磨擦力(friction) = 應用力(applied force)
  淨力仍是零(淨力 = 應用力- 磨擦力= 0)
  跟據牛頓運動第一定律當淨力是零物件會保持原有狀態(靜止或以均速移動),但現在物件的運動狀態是要視乎應用力的一方是否有運動,如有的話物件便以均速移動;若不,物件便會靜止。

三.當應用力(applied force)大於5N時,
  磨擦力(friction) = 5N
  淨力不是零(淨力 = 應用力- 5)
  跟據牛頓運動第二定律當淨力不是零時,物件會加速且加速的方向與淨力的方向一致。

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