NCERT Solution for Class 7 Science Chapter 13 - Motion and Time
NCERT Textbook Solutions are considered extremely helpful when preparing for your CBSE Class 7 Science exams. TopperLearning study resources infuse profound knowledge, and our Textbook Solutions compiled by our subject experts are no different. Here you will find all the answers to the NCERT textbook questions of Chapter 13 - Motion and Time.
All our solutions for Chapter 13 - Motion and Time are prepared considering the latest CBSE syllabus, and they are amended from time to time. Our free NCERT Textbook Solutions for CBSE Class 7 Science will strengthen your fundamentals in this chapter and can help you to score more marks in the examination. Refer to our Textbook Solutions any time, while doing your homework or while preparing for the exam.
NCERT Solution for Class 7 Science Chapter 13 - Motion and Time Page/Excercise 156
(i) Oscillatory motion
Concept insight: While running, the hands move to and fro and repeat their motion after regular intervals of time. Hence, their motion is oscillatory.
(ii) Motion along a straight line
Concept insight: The horse is pulling a cart on a straight road. Therefore, it has a motion along a straight line.
(iii) Circular motion
Concept insight: Merry-go-round has a circular motion. Therefore, a child sitting inside it will also have a circular motion.
(iv) Oscillatory motion
Concept insight: The child on a see-saw goes up and down continuously. It oscillates up-down. Therefore, it is an oscillatory motion.
(v) Oscillatory motion
Concept insight: The hammer hits the electric bell and vibrates rapidly. Therefore, it is an oscillatory motion.
(vi) Motion along a straight line
Concept insight: The train is moving on a straight bridge. Therefore, it has a motion along a straight line.
Concept insight: S.I. unit of time is second.
(ii) Not correct
Concept insight: An object can move with constant or variable speed.
Concept insight: Since the distance between two cities can be very large and kilometre is a big unit of distance, so distance between two cities is measured in kilometres.
(iv) Not correct
Concept insight: Time period of a pendulum depends on the length of the thread. Hence, it is constant for a particular pendulum with a fixed length.
(v) Not correct
Concept insight: The speed of a train is measured either in km/h or m/s.
NCERT Solution for Class 7 Science Chapter 13 - Motion and Time Page/Excercise 157
The distance covered by the blue car (as evident from the photograph) from one horizontal white strip to another, which is measured by scale is 1.2 cm.
It is given that 1 cm is equivalent to 100 m.
Therefore, 1.2 cm is equivalent to 120 m.
Distance travelled by the car = 120 m
Time taken to cover this distance = Time interval between the two photographs = 10 s
Vehicle A is moving faster than vehicle B.
Speed is given by the relation:
This relation shows that the speed of a vehicle is greater if it covers greater distance in a given interval of time. To compare the distance, draw a line perpendicular to the time-axis, as shown in the following distance-time graph.
From the graph, it is evident that for a given time t, the distance covered by vehicle A is greater than that covered by vehicle B. Hence, vehicle A is moving faster than vehicle B.
In a distance-time graph, the constant speed of a body is be represented by a straight line.
In a distance-time graph, a straight line parallel to the time axis indicates that the body is not moving.
A curved line on the distance-time graph indicates that the body is moving with a speed which is not constant.
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