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Center of Gravity. Challenge: Leg Lift Stable vs. Unstable.

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Presentation on theme: "Center of Gravity. Challenge: Leg Lift Stable vs. Unstable."— Presentation transcript:

1 Center of Gravity

2 Challenge: Leg Lift

3 Stable vs. Unstable

4 Stable Structures The forces of gravity acts on all parts of the structure All parts are evenly distributed around the center of gravity = the structure is stable


6 Unstable Structures A structure may collapse if the external forces causes the structure to become unbalanced Also known as an unbalanced structure


8 Firm Foundation The foundation must be stable. If not, compressive forces may cause structure to tip and become unstable. Soil type and formations critically important in building planning

9 Build on FIRM FOUNDATION!!! Leaning Tower of Pisa

10 Class Challenge: Super Glue Chair

11 Center of Gravity


13 What is center of gravity? The center of gravity is the specific point where all of the mass of the structure is evenly distributed around

14 Mass vs. Weight Mass Amount of matter in an object Weight Force of gravity felt on that object


16 What is equilibrium A state in which opposing forces or influences are balanced in a system A state of physical balance

17 What is a system A structure made up of parts all related to one another

18 Challenge: The Impossible Leap

19 Ways to Increase Stability Lower the center of gravity = widening structure Increase speed (bike)


21 Ruler Experiment

22 Experiment: Spoon & Fork Steps 1. Hand in your graphic organizer. 2. In partners of 2, get a spoon, fork, toothpick and a beaker 3. Put fork and spoon together 4. Add toothpick 5. Find center of gravity by balancing on table *Bonus* - break off toothpick where center of gravity is 6. Draw your system and label. Include center of gravity, equilibrium line. Explain why the system is balanced (ie: why is it balancing?)



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