The FBD you choose depends on what forces you want to find

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Presentation transcript:

The FBD you choose depends on what forces you want to find

The FBD you choose depends on what forces you want to find If you want to know the force in this hydraulic Piston, then…

The FBD you choose depends on what forces you want to find If you want to know the force in this hydraulic Piston, then… The FBD would “cut” the Hydraulic Piston so That the force on the piston is EXTERNAL to The FBD

The FBD you choose depends on what forces you want to find

The FBD you choose depends on what forces you want to find If the driver is pulling on the steering wheel and You want to analyze the forces on the driver, then…

The FBD you choose depends on what forces you want to find If the driver is pulling on the steering wheel and You want to analyze the forces on the driver, then… This might be the FBD

The FBD you choose depends on what forces you want to find If the driver is pulling on the steering wheel and You want to analyze the forces on the driver, then… Wheel pulls on The driver This might be the FBD

The FBD you choose depends on what forces you want to find If the driver is pulling on the steering wheel and You want to analyze the forces on the driver, then… Floor pushes Back on the Driver This might be the FBD

The FBD you choose depends on what forces you want to find If the driver is pulling on the steering wheel and You want to analyze the forces on the driver, then… His weight Goes down This might be the FBD

The FBD you choose depends on what forces you want to find If the driver is pulling on the steering wheel and You want to analyze the forces on the driver, then… The seat pushes Back up This might be the FBD

What FBD do we choose to find the wheel reaction forces at H and K?

What FBD do we choose to find the wheel reaction forces at H and K?

What FBD do we choose to find the wheel reaction forces at H and K? The seat pushes Back up

What FBD do we choose to find the wheel reaction forces at H and K? The seat pushes Back up

What FBD do we choose to find the wheel reaction forces at H and K? For the GIVEN Problem, these are internal forces, not external FBD The seat pushes Back up