Chapter 7 - Stationary Positions

Question 1

What are the four definitions of Centre of Mass (Gravity)

Answer 1

1) The balance point of a body
2) The point about which all the body’s mass is equally distributed in all directions
3) The point in which a body rotates when it is free in space
4) The intersection of the 3 primary axis

Question 2

The Centre of Mass is not a fixed point, true or false?

Answer 2

True, as the body moves the COM will also move

Question 3

What are the 3 stationary positions?

Answer 3

1) supports (plank)
2) hangs (hanging from rope or bar)
3) balances (balancing on one foot)

Question 4

How does the COM work with the 3 stationary positions?

Answer 4

Supports: COM is close to your base of support = stable
Balance: COM is close to the edge of the base of support = unstable
Hangs: COM is directly below the base of support = most stable

Question 5

What are the three basic support?

Answer 5

• front supports
• back supports
• bridge supports