Unit 3: Amazing Structures

Question 1

Net force

Answer 1

Sum of all forces acting on an object

Question 2

Freebodied Diagram

Answer 2

A diagram showing all the magnitudes and directions of forces applied on an object

Question 3

Beam Bridge

Answer 3

• Made of a “beam” (Flat, Long Structure that is supported at the edges.
• The most strain is on the middle of the beam
  Potential breakage/damage highest chance at the middle of the beam

Question 4

Truss

Answer 4

• Structure made of a web of simple geometric shapes
• Using thin, short beams to create shapes
• Beams are attached to each other at the ends
  The entire assemblage acts as one individual structure

Question 5

Arch

Answer 5

• A horizontally curved structure
• Highest at the center
• A frame that supports the underside of the arch
  Flat structure spanning the lower area that can be traveled on

Question 6

Cantilever

Answer 6

• Built using Cantilevers (high vertical structures that support the bridge )
• The cantilevers are spread evenly as to distribute the weight
  The bridge structure descends downward on both sides of the cantilever till it meets in the middle of the two cantilevers

Question 7

Suspension

Answer 7

The deck, or the part Is suspended from an upward support, it does not have anything to support it below
The weight is distributed onto anchorages

Question 8

Cable Stayed

Answer 8

• ONLY the towers bear the weight of the bridge
• Very similar to a suspension bridge
  Cable supports structure upwards.

Question 9

Law of parallelogram forces

Answer 9

If two vectors acting on a particle at the same time be represented in magnitude and direction by the two adjacent sides of a parallelogram drawn from a point their resultant vector is represented in magnitude and direction by the diagonal of the parallelogram drawn from the same point .

Question 10

Equilibrium

Answer 10

• When forces are balanced (they cancel each other out)
• Net force = 0 N
• No acceleration, decelleration caused

Question 11

Strain

Answer 11

• The measure of how much an object is stretched or deformed - because of load
• Can exist even when there is static equilibrium

Question 12

R (Reaction)

Answer 12

• Thirdlaw force/Normal Force

- Reaction force to an applied force

Question 13

Elastic

Answer 13

• A material that returns to its original shape after deformation

Question 14

Center of Gravity

Answer 14

• Sometimes same as center of mass
• Mass is distributed evenly around it
• It can balance

Question 15

Moment

Answer 15

Force (N) x Distance from Fulcrum(m)

Question 16

Tensile Strength

Answer 16

Maximum Load a material can support without fracture when being stretched, divide dby the original cross sectional area of the material.

Question 17

Compressive Strength

Answer 17

The capacity of a material or structure to withstand loads tending to reduce size