#
Motion and Time NCERT Solutions - Class 7 Science

## NCERT Solutions for Class 7 Science Chapter 13 - Free PDF Download

NCERT Solutions for class 7 science chapter 13 PDF is finally available for all the students on the official website of Vedantu. You can download the solution PDF at any time as per your convenience. It provides you with all the accurate solutions of NCERT questions. All these solutions are collectively prepared by the Vedantu science tutors who have long years of teaching experience. NCERT solutions will help you gain a better knowledge of the chapter. You can also download NCERT Solutions for Class 7 Maths to help you to revise complete syllabus and score more marks in your examinations.

In case you have any doubts about this topic, you can reach out to Vedantu experts through our official website and they will help you clear all the doubts.

## NCERT Solutions for Class 7 Science â€“ Free PDF Download

Are you trying to find the NCERT answers for class 7 homework? You are finally on the right page. All the NCERT solutions are uploaded in PDF format on the official Vedantu website. You can download the entire PDF for free and complete your assignment. Accurate answers and proper presentation of each answer will help you secure good grades in your assignments and exams.

Chapter 13 â€“ Motion and Time

## NCERT Solutions for Class 7 Maths Chapter 13

### Introduction

You have already studied about different types of motion in class VI. A motion as you know can be along a straight line, circular or periodic. In this chapter, you shall learn in detail about types of motion in detail.

### 13.1 Slow or Fast

You must have seen vehicles moving on the street. Just by observing those vehicles, you can easily identify which one is moving faster than the other. Read activity 13.1 carefully and observe the diagram to understand the concept of slow and fast movement of vehicles in a better way.

### 13.2 Speed

The distance covered by an object in a unit time is known as the speed of the object. You might have heard your father saying that the car is moving at a speed of 60 kilometers per hour. This statement simply means that the car is covering 60 kilometers in one hour. The formula of speed as used in this chapter is given below.

Speed = (Total distance covered)/(Total time taken).

In this section, you shall learn in detail the concept of speed and speed of different objects, in the context of the time taken by the objects to complete any particular task.

## 13.3 Measurement of Time

Have you ever wondered, if the clock wasnâ€™t a part of our lives, how would we have known the time of the day? Well, our ancestors back then obviously did not have clocks with them. You know, many events in nature repeat themselves after specific intervals of time. In this section, you will also learn about a pendulum.

The to and fro motion of a simple pendulum is known as oscillatory motion or periodic motion. The small metallic ball of a pendulum is called the bob. The time taken by a pendulum to complete one oscillation is known as its time period. Observe figure 13.4 (a) and (b) to understand the working of the pendulum in a better manner.

(images will be uploaded soon)

Units of Time and Speed

As all quantities are measured in metric units, there are units for the measurement of time and speed, as well.Â

The S.I. unit of time = Second (s).

The S.I. Unit of Speed = Meters per second (m/s).

In this section, you shall learn about the different units of speed.

### 13.4 Measuring Speed

Now, you have learned about the calculation of distance and time. With the time taken by an object to cover a particular distance, you can easily calculate the speed of an object. In this section, you shall learn to calculate the speed of a ball. Similarly, you can use the formula as explained in this to calculate the speed of other objects as well. You must have noticed a meter-like device fitted in your vehicles. It has km/h written in the corner. It is the device that records speed in km/h and is known as a speedometer. The other meter that measures the distance moved by the vehicle is known as an odometer.

### 13.5 Distance - Time Graph

You have already studied about different graphs in mathematics. This section deals with the concept of a distance-time graph. The distance and time can be represented through a bar graph, a pie chart, as well as a line graph. In this section, you shall learn in detail about different distance-time graphs and their formation. Distance-time graphs are generally used to present the motion of any object in a pictorial form. The distance-time graph for the motion of an object that is moving with a constant speed is a straight-line graph. In this section, you will not only learn to read such graphs, but you will also learn the step method of plotting a graph.

Exercise Solutions: 13 Question (2 short questions and 11 long questions).

Extended Learning â€“ Activities and Project (4 Questions).

### Key Features of NCERT Solutions for Class 7 Science

It is always essential to have a proper understanding of all NCERT questions to secure good marks in the exam. With the help of the science solutions prepared by Vedantu experts, students can learn and practice the correct answers to the questions from all topics. It will also help you to develop a better understanding of all the concepts. Some notable key features of Vedantu solution PDF are:

It provides easy assistance and important study material to all the students struggling to find accurate answers to their NCERT questions.

This PDF is available for free to all the students regardless of any criteria.

There is no time restriction for downloading the solution PDF. Students can download it at any time as per their convenience from the official website of Vedantu.

This will help you to revise your NCERT concepts, thereby facilitating a better understanding of the appropriate answering pattern. So, it will help you to score well in exams.

**Study without Internet (Offline)**

**App**