Rigid Body Equilibrium

What is degree of freedom refers to?

• The numbers of independent forces or vectors required to specify the state of an object

• The numbers of independent parameters or values required to specify the state of an object

• The numbers of independent moment or values required to specify the state of an object

• The numbers of independent line or vectors required to specify the state of an object

Draw free body diagram

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Step 3 of determining free body diagram

• Select and isolate an object

• Select a reference frame

• Identify all loads

• Label the diagram

Draw free body diagram/ reaction

Two -dimensional rigid body have ......... degrees of freedom

• one

• three

• two

• four

Below are the example of rigid body except:

• Beam

• Slab

• Cement

• Column

If a system is in static equilibrium, it must have the following 2 conditions:

• ∑τ=0

• Constant acceleration

• ∑F=0

• Positive forces only

Giving the following image, there are _____ forces acting on the sytem.

• 3 forces (weight 1, weight 2, and distance 2)

• 2 forces(weight 1 and weight 2)

• 1 force (weight 1)

• 1 force ( weight 2)

The moment of a 50 N force 20 cm away from the pivot point will be...

• 500 N

• 20 Nm

• 10 Nm

• 15 Nm

What is the primary purpose of a free body diagram?

• To determine the speed of an object

• To calculate the mass of an object

• To visualize forces acting on an object

• To measure the temperature of an object