Exploring Frictional Forces

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Presentation transcript:

Exploring Frictional Forces Friction and Newton’s Laws Static and Kinetic Friction Coefficient of Friction Practice

TeachWithFergy Preview File If you decide to purchase and the lesson isn't exactly what you need or thought it was, I will refund you 100% via PayPal. Some slides appear blank because they have been removed. Other slides may have ........... on them, this represents writing that has been removed. Please note that the Entire Unit Package can also be purchased at a steep discount from my Store.

Friction The analysis of friction is very important to practical situations since friction is present everywhere. Friction is a good and bad thing. Good when our tires meet the pavement Bad when reducing efficiency and/or producing heat In slideshow mode, click the image and your video will start automatically

Friction Friction always opposes motion (or Fnet) Kinetic friction Static friction Air resistance

Friction and Newton’s Laws Friction is simply a force included and accounted for in a FBD. Applies to situations where: Fnet = 0 Fnet = ma

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Static Friction The magnitude of the force needed to start a stationary object moving is the maximum static friction, FSmax

Kinetic friction Kinetic friction acts on any object that is in motion The magnitude of the force needed to keep the …………….

Coefficients of Friction The coefficient of friction is a ratio of the magnitude of the force of friction between two surfaces to the normal force between those surfaces.

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Check Your Understanding A crate of fish of mass 18.0 kg rests on the floor of a parked delivery truck. The coefficients of friction ………………. a horizontal force of 75.0 N [E] is applied to the crate? if a horizontal force of 95.0 N [E] is applied? Answers: a) No movement because the Fapp < Fs b) FK = 72.3 N [backwards], a = 1.26 m/s2

Check Your Understanding A musician applies a horizontal force of 17 N [W] to an instrument case of mass 5.1 kg. The case slides across a table with an acceleration of 0.39 m/s2 [W]. What is the coefficient of kinetic friction between the case and the table? Answer: μK = 0.30