Question

Q.3 (a)

Define the following terms.

(4)

1.Rotation

2.Revolution
​

Answer 1

Answer:

1.rotation is a circular movement of an object around a centre of rotation. If three-dimensional objects like earth, moon and other planets always rotate around an imaginary line, it is called a rotation axis. If the axis passes through the body’s centre of mass, the body is said to rotate upon itself or spin.

Explanation:

2.is used when one body moves around another, while rotation is used to mean the movement around the axis. For example, the Moon revolves around the Earth and the Earth revolves around the Sun.

Answer 2

Answer:

1.Rotation-A rotation is a circular movement of an object around a center of rotation. A three-dimensional object can always be rotated about an infinite number of imaginary lines called rotation axes. If the axis passes through the body's center of mass, the body is said to rotate upon itself, or spin.

2. Revolution-Revolution is the movement of the Earth around the Sun. The Earth takes 24 hours to complete a rotation with respect to the sun. ... The path of the Earth moving around the Sun is called an orbit. The Earth's orbit is elliptical.

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