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SPH4U: Lecture 8 Notes - The Burns Home Page

SPH4U: Lecture 8 Notes - The Burns Home Page

SPH4U: Lecture 8 Notes - The Burns Home

SPH4U: Lecture 8Today’s Agenda• Friction Recap• Drag Forces‣ Terminal speed‣ A special very cool demo….• Dynamics of many-body systems‣ Atwood’s machine‣ General case of two attached blocks on inclined planes‣ Some interesting problemsFriction Review:• Surface friction is caused by the “microscopic” interactionsbetween the two surfaces:‣ See discussion in textSPH4U: Lecture 8, Pg 1SPH4U: Lecture 8, Pg 2Model for Surface Friction• The direction of the frictional force vector f F is perpendicular to thenormal force vector N, in the direction opposing relative motion ofthe two surfaces.Frictional force vs applied force• Graph of Frictional force vs Applied force:• Kinetic (sliding): The magnitude of the frictional force vector isproportional to the magnitude of the normal force N.f F = K NIt moves, but it heats up the surface it moves on!f F = S Nf F = K N• Static: The frictional force balances the net applied forces such thatthe object doesn’t move. The maximum possible static frictionalforce is proportional to N.f F S N and as long as this is true, then f F = f A in oppositedirectionIt doesn’t move!f Ff F = F AF ASPH4U: Lecture 8, Pg 3SPH4U: Lecture 8, Pg 4Page 1

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