Centre of Gravity of Regular and Irregular Laminae

Try these questions

5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.

1. 1. What is meant by the centre of gravity of a body?

   • A. The point where the whole weight of the body appears to act
   • B. The point where the body is thickest
   • C. The point on the body that is closest to the ground
   • D. The point where the mass of the body is zero

2. 2. A uniform triangular lamina has a perpendicular height of 12 cm. How far is its centre of gravity above the base?

   • A. 3 cm
   • B. 4 cm
   • C. 6 cm
   • D. 8 cm

3. 3. A uniform metre rule is pivoted at its 50 cm mark. A 3 N weight is hung at the 10 cm mark. At which mark must a 6 N weight be hung on the other side of the pivot to keep the rule balanced?

   Type your answer (in cm) in the lesson.

4. 4. In the plumb line experiment to find the centre of gravity of an irregular card lamina, why must the plumb line hang from the same pin as the lamina?

   • A. So that the string can be used to measure the mass of the lamina
   • B. So that the vertical line it marks passes through the pivot, and the centre of gravity lies on that line
   • C. So that the lamina cannot swing freely
   • D. So that the lamina becomes symmetrical

5. 5. What is the name given to a flat sheet of uniform thickness and uniform density, such as a piece of cardboard cut into a shape?

   Type your answer in the lesson.

More in Moments and Equilibrium

• ▸Thermal Expansion in Matter
• ▸Revision and Practical Assessment of Thermal Phenomena
• ▸Introduction to Moments and Turning Effects
• ▸The Principle of Moments
• ▸States of Equilibrium
• ▸Factors Affecting Stability and Structural Design
• ▸Parallel Forces and Multiple Supports
• ▸Torque, Couples and Resolution of Forces

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