Moments & Truss Forces

What is the Right Hand Rule?

• Thumb up = Positive, Down = Negative

• Thumb Down = Positive, Up = Negative

• Rotating Towards Body = Positive, Away from Body = Negative

• Rotating Away from Body = Positive, Toward Body = Negative

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What does the Pivot describe?

• The point of rotation

• The point to measure distance from

• The screw head

• The pin location

What is compression?

• A body being squeezed

• A body being stretched

• A body being twisted

• A body being bent

What is tension?

• A body being squeezed

• A body being stretched

• A body being twisted

• A body being bent

A truss is composed primarily of what simple shape?

• Circle

• Square

• Triangle

• Rectangle

A pinned connection supports a truss in how many dimensions?

• 1

• 2

• 3

• 4

A roller connection supports a truss in how many dimensions?

• 1

• 2

• 3

• 4

The equation 2J=MR helps us determine if a structure is ______________.

• Statically Determinant

• Kinetically Determinant

• Build-able

• Cost Effective

What equation(s) do we use to solve a truss calculation? Select all that apply.

• ΣM=0

• ΣF_x=0

• ΣF_y=0

• ΣF_z=0

• 2J=MR

Tags

NGSS.HS-PS2-1

We use what method when solving truss calculations?

• Method of Joints

• Method of Members

• Method of Connections

• Method of Pins