This lab experiment is based on the fact that when an object is allowed to pivot about a point, the force of gravity will be exerted through the center of gravity of the object so as to rotate the object such that the center of gravity will always be vertically aligned within the pivot. Only when this alignment is complete does the moment due to gravity about the pivot become zero ($0$).
Aim
To find the approximate location of the center of gravity of an irregular lamina
Materials/Apparatus
- Retort stand
- Pin
- Tape
- Irregular lamina (leaf)
- Plumb line (a heavy mass on a string)
Diagram
Image Credits: revisionug.com
Method
- Bore three ($3$) holes close to the edge of the leaf
- Suspend the pin horizontally from the retort stand using the tape
- Hang the leaf through one of the holes
- Attach the plumb line to the end of the pin in front of the hole
- Draw a straight vertical line on the leaf where the plumb line falls
- Repeat steps $3-5$ for the two remaining holes
Results
Attach the leaf used in the lab.
Data Analysis
- Define the center of gravity
- State the factors affecting the stability of an object
- What are the three ($3$) types of equilibrium?
- How does each type differ with respect to the factors affecting stability?