Topic 7 Notes - Stable Structures

Question 1

What is a firm foundation essential for?

Answer 1

Stability of the structure

A poor foundation can lead to cracks and structural failure.

Question 2

Name one method to ensure a stable foundation.

Answer 2

• Build on solid ground
• Make a solid layer
• Spread out the load

These methods help prevent structural issues.

Question 3

Foundations can be constructed on solid bedrock or what other method?

Answer 3

Pilings

Pilings are large metal, concrete, or wood cylinders used to reach solid ground.

Question 4

What do many structures, like roads, rely on for stability?

Answer 4

A bed of closely compacted materials

This solid layer helps maintain stability.

Question 5

How can the load of a structure be increased for stability?

Answer 5

Spread out over a large area

This can be achieved through foundation footings.

Question 6

What is the center of gravity?

Answer 6

The specific point where all mass is evenly distributed

Engineers need to know this for structural stability.

Question 7

What device demonstrates spin stabilization?

Answer 7

Gyroscope

Gyroscopes spin tens of thousands of times per minute to maintain stability.

Question 8

Name one application of spin stabilization.

Answer 8

• Space satellites
• Football spiral
• Toy top
• Yo-yo
• Frisbee

These objects utilize spin stabilization for balance.

Question 9

What activity can help locate the center of gravity?

Answer 9

Balancing a random shape on your finger

This involves cutting out a shape and experimenting with balance.