Answer Briefly
1. What are the different modes of transport? Give two examples of each.
2. How will you judge whether an object is at rest or in motion?
3. How will you measure the length of a desk?
4. Why are handspan, cubit, arm length and footstep not used as standard units of length? 5. What is linear motion? Give examples
6. What is circular motion? Give examples.
Answers
Answer:
1) The different modes of transport are air, water, and land transport, which includes Rails or railways, road and off-road transport. Other modes also exist, including pipelines, cable transport, and space transport.
2) An object is said to be in rest when it does not change its position with time. If an object changes its position with respect to time it is said to be in motion.
3)For the two Lengths, when sitting behind the workstation, at or near the corner, the Left Hand Side Length is the distance from the front corner straight to the left hand side front end of the workstation.
4)Hand span and cubit are not used as standard units of length because their sizes vary from person to person. So, two different persons may give different measurements for the same length, which is not desirable for a standard unit.
5)Linear motion can be defined as the movement of a body on a straight line without any deviation. Important examples of linear motion are: An athlete running on a straight track of a park, a bullet shot from a pistol always moves in a straight line, etc
6)circular motion is a specific type of motion in which an object travels in a circle with a constant speed. For example, any point on a propeller spinning at a constant rate is executing uniform circular motion. Other examples are the second, minute, and hour hands of a watch .