3. 3. How can you measure the length of a curved line? Describe one method in detail. 4. What is translatory motion? Describe the different kinds of translatory motion. What is the difference between circular and oscillatory motion? Illustrate with examples. 5. 6. Differentiate between revolution and rotation with respect to motion. Illustrate with examples.
Answers
Answer:
Explanation:
3.To measure the length of a curved line ‘AB’ we take a long thread. We take one end of the thread and put it on the point ‘A’ of the curved line. Now, we move the thread along the curved line and hold the other end of the thread when it reaches the point ‘B’ . Now, we stretch the thread along a meter ruler and measure it. This is the length of the curved line.
4. motion in which all points of a moving body move uniformly in the same line or direction
5.Based on the movement of the object, translatory motion can be classified as:
Rectilinear Motion
When an object in translatory motion moves along a straight line, it is said to be in rectilinear motion. Translational motion is generally seen in rectilinear motion when the body moves in a straight line.
Example: A car moving in a straight line and a bullet which gets fired moves in rectilinear motion.
Curvilinear Motion
The motion of an object along a curved path is said to be in curvilinear motion. In this type of motion, the motion of an object/body follows a known or fixed curve. Curvilinear motion is a two-three dimensional motion.
Example: stone thrown into the air
6.A 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.
Revolution is often used as a synonym for rotation. However, in many fields like astronomy and its related subjects, revolution is referred to as an orbital revolution. It 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.