What is a Free Body Diagram?. Newton’s Third Law For every action, there is an equal and opposite reaction. THE TOP ROCK PUSHES DOWN ON THE BOTTOM ROCK.

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Presentation transcript:

What is a Free Body Diagram?

Newton’s Third Law For every action, there is an equal and opposite reaction. THE TOP ROCK PUSHES DOWN ON THE BOTTOM ROCK THE BOTTOM ROCK PUSHES BACK UPWARD ON THE TOP ROCK

What is a Force? A push or a pull acting on an object as the result of an interaction with another object.

Types of Forces Applied force: one object acts on another Wind pushing on the boat F app

Types of Forces Tension force: transmitted through string, cable, wire, rope, or chain Rope pulling on the boat F tens θ

Types of Forces Gravity force: weight; the mass of the Earth pulling on the mass of the boat Gravity pulling the mass of the boat down W

Types of Forces Normal force: support force Water pushing back up on the boat FNFN

Types of Forces Friction force: opposes the motion of the object Water pulling on boat FfFf

What is a Free Body? Substitute a simple shape for the object being analyzed. F app F tens W FNFN FfFf

Creating the Free Body Diagram

F tens FNFN W FfFf W FfFf FNFN θ θ

Creating the Free Body Diagram FNFN W W FNFN F app FfFf FfFf θ θ

Creating the Free Body Diagram WELCOME F tens F app W SIGN θ θ

Your Turn to Create a Free Body Diagram PHYSICS ARCHITECTURE

Your Turn to Create a Free Body Diagram PHYSICS ARCHITECTURE WW FNFN FNFN FNFN FNFN F app θ θ

A Different Method PHYSICS ARCHITECTURE WW FNFN FNFN FNFN FNFN F app θ θ

Pulley Systems M1 M2 FBD of M1: F tens FBD of the movable pulley: W M1 W M2 F tens Tension Forces (F tens ) are equal throughout the system.

Trusses A B C D L

A B C D L F AY F AX F DY

Trusses A B C D L F AY F AX F DY F AB F AC F CD F BC F BD

Trusses A B C D L F AY F AX F DY F AB F AC F CD F BC F BD F AY F AC NODE A F AX F AB

Trusses A B C D L F AY F AX F DY F AB F AC F CD F BC F BD NODE B F AB F BC F BD

B C D L F DY F AB F AC F CD F BC F BD Trusses NODE C L F CD F BC F AC

Trusses B C D L F DY F CD F BC F BD NODE D F DY F CD F BD

Trusses F DY F CD F BD D C L F CD F BC F AC B F AB F BC F BD A F AY F AC F AX F AB

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