Download presentation
Presentation is loading. Please wait.
Published byCornelia Dorsey Modified over 8 years ago
2
Chapter 5 Using Newton’s Laws with Friction, Circular Motion and Drag Forces
3
Introduction: Our approach Additions to our understanding on each side of ∑F = ma On the ∑F side:Friction – static and kinetic On the ma side: Circular motion – uniform motion – highway curves, banked and not – non-uniform motion More on the ∑F side: Drag force – terminal velocity
4
Friction Kinds (“rolling” later) – kinetic (sliding) – static Complex phenomena Example EXERCISE EXERCISE Problem solving using Newton’s Laws – location of additions to problem solving (see)see – framing the problem (esp. with static friction)
5
Uniform Circular Motion Acceleration – direction EXERCISE – representation (a R and a tan ) – uniform (=?) – a R = v 2 /R – a tan = 0 Exercises, examples Problem solving using Newton’s Laws – location of additions to problem solving (see)see
6
Highway Curves; Banked & Not Relation to both sides of Newton’s 2 nd Law When is there sliding on unbanked curves? What is the friction force on vehicles going on banked curves? Resource: http://www.mhhe.com/physsci/physical/giam battista/banked_curve/banked_curve.html http://www.mhhe.com/physsci/physical/giam battista/banked_curve/banked_curve.html
7
Non-uniform Circular Motion Components of acceleration – meaning – total acceleration (?) – magnitude of acceleration (?) Relation to Cartesian coordinate representation
8
Drag Force At “low” and “high” speeds; velocity dependence (?) Example, low speeds (e.g. boat in water) Terminal velocity – key? (a = 0) Example: In slow case, derive the expression for the terminal velocity? – Graph (roughly) the x,v,a motion graphs (?) Modeling, if time available
9
the end
10
friction exercise in groups, get whiteboards, pens, erasers Question: At what angle does a wood block slide down a wood incline? (See table 5-1.) – include other variables as needed Question: At this angle, describe the motion of the wood block down the wood incline? back
11
Using Newton’s Laws The Physical situation Choose/identify objects and forces Create simple FBDs Choose inertial coordinate systems Implement Newton’s Laws Mathematical representation Solution Problem back
12
Using Newton’s Laws The Physical situation Choose/identify objects and forces Create simple FBDs Choose inertial coordinate systems Implement Newton’s Laws Mathematical representation Solution Problem back
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.