Centre of Mass and Gravity Concepts

The video explores the concepts of centre of mass and centre of gravity, starting with historical insights from Galileo and Archimedes. It explains how the centre of mass is the point where a system's mass is concentrated, while the centre of gravity is where the weight acts towards Earth's centre. The video clarifies that in a uniform gravitational field, these points coincide, but differ in non-uniform fields. Practical applications, such as the Leaning Tower of Pisa, illustrate the importance of understanding these concepts in construction and equilibrium.

Who was inspired by Archimedes to explore the concept of gravity?

• Albert Einstein

• Isaac Newton

• Niels Bohr

• Galileo Galilei

What was Galileo's contribution to the study of gravity?

• He discovered the law of universal gravitation

• He wrote a treatise on the centre of gravity

• He invented the telescope

• He formulated the theory of relativity

What is the centre of mass?

• The point where an object is heaviest

• The point where an object is lightest

• The point where the gravitational force is strongest

• The point where all the mass of a system is concentrated

How can the centre of mass be found in a symmetrical object?

• At the heaviest end

• At the lightest end

• At the point of symmetry

• At the base of the object

What happens when force is applied at the centre of mass?

• The object moves upward

• The object remains balanced

• The object spins

• The object tilts

What does the centre of gravity emphasize?

• The mass of the system

• The weight of the system

• The volume of the system

• The density of the system

Where is the centre of gravity located in a uniform rod?

• At the top

• At the base

• At the midpoint

• At one end

How can the centre of gravity be determined for asymmetrical objects?

• Using a compass

• Using a scale

• Using a ruler

• Using a plumbline

What is the main difference between the centre of mass and the centre of gravity?

• Centre of gravity is independent of the gravitational field

• Centre of mass is independent of the gravitational field

• Centre of gravity depends on mass

• Centre of mass depends on gravity

When can the terms centre of mass and centre of gravity be used interchangeably?

• In a non-uniform gravitational field

• In space

• Underwater

• In a uniform gravitational field