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# NCERT Exemplar Class 7 Science Chapter 13 Solutions: Motion and Time

NCERT Exemplar Class 7 Science Solutions for Chapter 13 ‘Motion and Time’ have been compiled to help you understand the basic concepts of physics. In this chapter of NCERT Exemplar Class 7 Science, you will be introduced to concepts such as motion, periodic motion by a pendulum, the speed with respect to time and the methods of measuring speed. You will learn how to draw a distance-time graph and the implications of the same.

The NCERT Exemplar problems of the chapter will help you build strong fundamentals for more complicated topics of science in higher classes. There are a total of 20 Exemplar problems under different sub-headings such as multiple-choice questions, short and long answer type questions respectively. You will learn how to relate science with your day to day life by solving these questions. Besides the fascinating concepts of this chapter, it also carries a significant weightage from the CBSE exam perspective.

It is very important that you practice the NCERT Exemplar problems and solutions from for clarity in the notion of time and motion. Instasolv is dedicated to compiling a set of Exemplar solutions that will solve your queries and will remain relevant from the exam point of view. The science experts at Instasolv rely on data gathered from various researches to know what doubts you might stumble upon while studying. This is what makes Instasolv an inclusive and interactive platform.

## Topics in NCERT Exemplar Class 7 Science Solutions Chapter 13 – Motion and Time

Introduction to Motion

Motion is the change in position that is incurred by an object with respect to time. The different types of motions are motion in a straight line, circular and periodic motion. To decide if an object is fast or slow, we compare the distance covered by the moving object with respect to a given time frame.

Speed

When an object covers a certain distance in a given unit of time, we term it as the speed with which the object was moving. Therefore, the more the distance covered in the given time, the faster is the speed of the object.

Uniform and Non-Uniform Motion

If the speed of an object changes while it is in motion in a straight line, it is known as non-uniform motion while if remains constant, the motion is said to be uniform in nature.

Periodic Motion

When a pendulum does to and fro motion after being released from a certain height, it is known as periodic motion. The time taken to complete one cycle of periodic motion is known as its time period.

Units of Time and Speed

1. Time: The SI Unit of time is second denoted by s. Other units are minutes, hours.
2. Speed: The SI Unit of speed is m/s, other units can be m/min, or km/hr, etc.
3. The symbols for all the units must always be written in the singular form.

Measuring Speed and Distance

In a vehicle, speed is displayed by the speedometer and has the unit km/hr.

The distance covered by a vehicle is displayed by the odometer of the vehicle in km.

Distance-Time Graph

In a distance-time graph, the x-axis represents the time axis and distance is given by the y-axis. The slope of the graph gives the speed of the respective object.

### Exercise Discussion of the NCERT Exemplar Problems for Class 7 Science Chapter 13 – Motion and Time

1. The exercise of NCERT Exemplar Class 7 Science Exemplar Chapter 13 comprises a wide variety of objective and subjective questions for you to practice.
2. Questions from 1 to 9 are multiple-choice questions which also contain numerical problems of speed and motion.
3. Questions from 10 to 17 are very short answer type and short answer type questions comprising of topics related to oscillatory motion and relationship between time and speed.
4. The remaining questions from 18-20 are long answer type questions based on the graphical representation of distance and time.
5. The questions are based on the latest CBSE exam pattern.

## Why Use NCERT Science Exemplar Solutions Class 7 Chapter 13 by Instasolv?

The science experts of Instasolv have answered each and every NCERT Exemplar problem of CBSE Class 7 Science Chapter 13 without even minimal compromise on the quality of answers. The answers by Instasolv are on-point and precise. These answers by Instasolv are given in line with the guidelines provided by the CBSE board. Referring to Instasolv solution will help you gain sustainable knowledge about your subject that will give you good ranks and build strong fundamentals for more complicated concepts of science.

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