1) The pitch of the roof is determined by the angle between the roof plane and the horizontal. a) stable-balance b) unstable-imbalance 2) Diagram shows a scissor is evenly open. What is the state of the system? a) stable-balance b) unstable-imbalance 3) Two intersecting roads cross each other unevenly, causing the vertical angles at the intersection to be unequal. What is the state of the system? a) stable-balance b) unstable-imbalance 4) Diagram shows that the blades of a helicopter form an equal vertical angles at the point where they cross each others. What is the state of the system? a) stable-balance b) unstable-imbalance

Vertical angles

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