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READ section 3-1 and revisit the Free-Body Exercises problems using these new vector skills.
Force Diagram Problems.pdfBook on Wall Problem to Whiteboard
Find the acceleration of the book! Draw a sketch, a system schema, a force diagram, and a net force diagram for the book on a whiteboard.
Draw this in four quadrants like we have in class.
Use the Newton's Second Law in component form to find the acceleration.
Chapter 3 Problems - for easy access!
To turn in:
3-1 Quiz: P 2, 5 for VFPM-1
Quiz VFPM-2
Create a quantitative force diagram including all forces and components for a block on an inclined plane in equilibrium. Turn this in!
Ch 3-Problems.pdfFriction Investigation
We're investigating three factors and their effects on friction forces.
These are: Surface Area, Surface Type, and Normal Force.
Surface Area: For one surface, measure the friction force from two different sides of the block.
Normal Force: For one surface, measure the friction force for a range of different normal forces. As possible, record both static and kinetic friction force for each normal force.
Surface Type: For one normal force, measure the kinetic friction on several surfaces.
Use the lab guide provided in Google Classroom for your lab development.
Friction Math Basics
So you've taken data for friction force and normal force. When we plot this, we see that the friction force increases with normal force when other variable are held constant.Finding the SLOPE of this graph is key - when friction force is plotted on the y-axis and normal force on the x-axis, The slope of this graph provides a quantity called the coefficient of friction.We use the Greek letter µ (read "mu") to represent this coefficient of friction. Thus the slope µ = Ff/FN. Another way to write this is to solve it for the Friction Force. Then Ff = µ • FN . This tool becomes VERY useful now!
Projectile Practice Problems...
Pop these open in a new window. Then take them one at a time in your problem notebook and try them out. Please read below and then use the videos I posted to get started...We have shown, with a few demos, that horizontal and vertical motion are independent. This is an approach that makes dealing with projectile problems mathematically much more approachable! Using your vector component skills, consider separating the horizontal motion from the vertical motion any time we're dealing with 2D motion. Then, we can use our typical two (usually don't need the third) equations to do everything we need.
Start out with the tool (equation) that will solve for what you need (either H or V distance or velocity). Then, when stuck because there are multiple unknowns, switch to the other component and you'll be able to pick up the needed unknown.
Projectile Practice Problems.pdfCheck out my first video for a basic setup example. (Note I start with the velocity equations - to show how they are used - but you don't really need these in the first problem.) In the second half of the first video I use the distance tool to find horizontal range.
The audio isn't great - but give it a shot!
[In the second half--the video seems to be about 8-10 seconds behind the audio.]
In the second video, I run the third problem. Not how I start with horizontal distance (as that's what we're trying to find). Then when I need more info, I switch to the vertical equation - and the info we need can be determined. Then I go back to the initial equation and finish it out.
December 11, 2018_1.movDecember 11, 2018_2.movHere are worked out solutions to the projectile practice problems for reference!
Projectile Problems Soln.pdfHere are practice problems for VFPM - the solutions
are posted here for your use...
Projectile Practice Problems Key.pdfReport abuse