(b) Write the precautions to be followed, when a metre scale is being used for measuring a given length. 4 Explain the difference between 'rest' and 'motion'. Give two examples of each. 5. Distinguish between: (a) Rectilinear and Curvilinear motion (b) Rotation and Revolution Give one example of each from our daily life. 6. Define the following types of motion: (a) Rectilinear motion (b) Circular motion Give one example for each of these two types of motion.
Answers
Answer:
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Explanation:
1. The precautions to be taken while using a meter scale to measure lengths are as follows : (1) The scale should be placed to the side of the object being measured. It should also be in touch with the object being measured. (2) While reading the scale, eye must be placed vertically above the scale mark being read.
2. Rest: An object is said to be at rest if it does not change its position with respect to its surroundings with time.
Motion: An object is said to be in motion if the position changes with respect to it surrounding and time.
Examples of motion
Walking
Writing
Driving
Dancing
Examples of rest
Sleeping
Staring
Standing
Stopped clock
3. In rectilinear motion the body travels in a straight line whereas in curvilinear motion the body travels in a curved path. In rectilinear motion the body can travel with uniform velocity whereas in curvilinear motion the velocity keeps changing as the direction keeps changing.
4. Rotation" refers to an object's spinning motion about its own axis. "Revolution" refers the object's orbital motion around another object. For example, Earth rotates on its own axis, producing the 24-hour day. Earth revolves about the Sun, producing the 365-day year.
An example of revolution is movement of the earth around the sun. An example of revolution is the war fought between the colonial people and Great Britain.
5. A linear motion in which the direction of the velocity remains constant and the path is a straight line.
Eg:- The use of elevators in public places is an example of rectilinear motion.
6. Uniform 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.