Free Body Diagrams The Standard p-2.7 ~ Use a free-body diagram to determine the net force and component forces acting upon an object. The Examples The Video The Lab The Equation F = ma The Examples Force of Gravity Normal Force Applied Force Air Resistance and

Friction Force of Gravity Air Resistance The Problem A truck pulls a trailer on a flat stretch of road. The forces acting on the trailer are the force due to gravity (250,000 N downward), the force exerted by the road (250,000 N upward), and the force exerted by the cable connecting the trailer to the truck (20,000 N to the right). The forces acting on the truck are the force due to gravity (80,000 N downward), the force exerted by the road (80,000 N upward), the force exerted by the cable (20,000 N to the left), and the force causing the truck to move forward (26,400 N to the right).

a) Draw and label a free-body diagram of the trailer

b) Draw and label a free-body diagram of the truck Trailer 250,000 N 250,000 N 20,000 N Truck 20,000 N 26,400 N 80,000 N 80,000 N - Example Problems

- Equation used

- Explanation of Free Body Diagrams In this video... Citati ns http://www.wilco.org/CountyDepartments/TaxAssessorCollector/MotorVehicleDivision/Trailer/tabid/3040/Default.aspx http://www.wired.com/wiredscience/2010/03/skydiver-aims-to-jump-from-120000-feet-break-the-sound-barrier/ http://en.wikiversity.org/wiki/Lesson:Always_Draw_a_Freebody_Diagram What Is It? Parts of a Free Body Diagram Why Do We Use It? So What? Diagrams that show force vectors as arrows 1) Object

2) Force of Gravity

3) Normal Force (The force counteracting gravity)

4) The Applied Force (Like pushing a ball)

5) Friction and Air Resistance Free Body Diagrams, also known as force diagrams, help analyze situations. They are used to graphically understand all of the forces acting upon an object or series of objects. Forces in 1 Dimension http://phet.colorado.edu/en/simulation/forces-1d Using the Free Body Diagrams we can find the net force of an object. A net force is the sum of all forces acting on an object. This is demonstrated on Page 127 in our book. 250,000 N 250,000 N 20,000 N A - The Trailer B - The Truck 80,000 N 80,000 N 26,400 N 20,000 N Demonstration What you need... - 1 Car

- Group of Students What you do... - Record the weight of the car and calculate what the force of gravity is on the car. Also, record the Normal Force

- Measure out 2 meters in front of the car and put a line of tape down

- Put the car in neutral and push the car. Measure the time taken to move the car 2 meters and calculate the Applied Force.

- Draw a Free Body Diagram "Push the Car" F g F n F a F f Net Force = F - F a f http://virtualreallity.blogspot.com/2011/07/beautiful-sports-bike.html http://creatingfreebodydiagrams.wikispaces.com/Creating+Free-Body+Diagrams http://www.taylorphysics.org/forces.html http://www.thetorquereport.com/2009/03/tesla_model_s_fits_seven_start.html

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# Free Body Diagrams

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