E. Short Answer Questions:
1. When is an object sald to be in motion?
2. Mohan goes to see the Republic Day Parade with his father. He is very happy to see the si
marching in harmony. He tells his father of his desire to be a soldier.
(a) Which type of motion do soldiers in a parade show?
(b) What value do we learn from the marching soldiers?
3. Define multiple motion. Give two examples of this kind of motion.
4. Name the two kinds of motion of the earth.
5. Give two precautions to be taken while measuring the length of a pencil using a scale.
6. What is meant by periodic motion? Give two examples of periodic motion​
Answers
1. An object is said to be in motion if it changes its position with respect to time.
2.a. Soldiers of parade show Rectilinear motion.
b. As we know that marching is performed in a straight line so from this we can say that motion along a straight line is called rectilinear motion.
3. When an object shows more than one type of motion at a time then it is to be said as multiple motion. For example-
a. A pendulum shows both oscillatory motion and periodic motion at a same time.
b. The second hand of a clock shows both uniform circulatory motion and periodic motion at same time.
4. Circular motion and Rotatory motion.
5. a. Angle of reference can bring a change in the measure.
b. Scale must be accurate.
6. An object is said to be in periodic motion ot it repeats same thing after some time. For example-
a. The ringing of bell of school.
b. A pendulum.
Hope it will help you
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Answer:it is translatory motion
Explanation:because soldiers move their whole body during parade and the defination of the translatory motion is when all the parts of an object move the same distance at a given time than the object is said to be in translatory motion....but the soldiers can move in any path
- it could be curv also
- it can be straight also
that is why we ca't say that the soldiers are parading in rectillinear or curvillinear or circular motion