Motion and Time NCERT Solutions – Class 7 Science

Exam preparation is incomplete if students do not solve NCERT questions. Solving NCERT questions always gives students an edge in exams. Many of the exam questions follow a pattern very similar to NCERT texbook exercises. Hence, to guide students, Extramarks offers students NCERT Solutions for Class 7 Science Chapter 13. These are clear and concise answers to textbook questions given in this chapter. They will help students to prepare more effectively, write better answers in their exams, and get help in their  revision just before the exams.

NCERT Solutions for Class 7 Science Chapter 13 

Access NCERT Solutions for Class 7 Science Chapter 13 – Motion and Time

NCERT Solutions for Class 7 Science 

You can find all the NCERT answers for Class 7 in-text and end-text questions of this chapter. The NCERT solutions are available to download from the official website or app of Extramarks. Accurate answers and proper presentation of each answer will help you secure good grades in your assignments and exams.

Chapter 13 – Motion and Time

Introduction

You have already studied different types of motion in Class 6. A motion, as you might know, can be along a straight line, or would be circular or periodic. In this chapter, you will learn in detail about the different types of motion.

13.1 Slow or Fast

You must have noticed different vehicles on the road. You can easily tell which one of them is moving faster than the other one by just looking at them. Read activity 13.1 carefully and look at the diagram to grasp the concept of slow and fast vehicle movement in a better form.

13.2 Speed

The speed of an object is the distance it travels in a given amount of time. You may have heard your father telling you that the car is travelling at 60 kilometres per hour. This indicates that the vehicle travels 60 kilometres in one hour. In this chapter, you will further study the concept of speed and the speed of various items and the time it takes for the objects to perform a task.

13.3 Measurement of Time

Have you ever wondered, how would anyone know the time of the day without a clock? Our ancestors did not have clocks with them at that time. As you may be aware, many natural events repeat themselves at regular intervals of time. This section of this chapter talks about time. You’ll also learn about a pendulum in this segment.

Oscillatory motion, also known as periodic motion, is a basic back and forth motion of the pendulum. The bob is the little metallic ball at the end of a pendulum. The pendulum period is the amount of time it takes to complete one oscillation.

Units of Time and Speed

Since all values are measured in metric units, we also have units for measuring time and speed.  The different units of speed will be discussed in this section.

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

S.I. unit of speed=Metre per second (m/s)

13.4 Measuring Speed

Now that you have learnt how to calculate distance and time,you can calculate an object’s speed using the time it takes to travel a specific distance. In this section, we will also learn how to determine the speed of a ball through activity 13.3. Thereafter, you can practise calculating the speed of other objects by using the formula. You might have seen a metre-like gadget installed in cars or bikes. Note that one of the metres has km/h written in the corner. This device is known as a speedometer that measures speed in kilometres per hour. Whereas, the odometer is the other metre that measures the distance travelled by the vehicle.

13.5 Distance – Time Graph

In Mathematics, you’ve previously learned about several graphs. The concept of a distance-time graph is discussed in this section. A bar graph, a pie chart, and a line graph, all can show distance and time. This section will tell us about various distance-time graphs and how they’re made. In general, distance-time graphs are used to depict the motion of any object in a visual format. A straight-line graph represents the distance-time graph of an item travelling at a constant speed. You will learn how to read such graphs and how to plot them step by step in this section.

Key Features of NCERT Solutions for Class 7 Science

Some of the key features of NCERT Solutions for Class 7 Science by Extramarks include:

  • Clear and concise explanations
  • Drafted by subject matter experts for accuracy
  • Examples and Illustrations that help get a better understanding of the solution
  • Great for last-minute revisions and exam preparations.

FAQs (Frequently Asked Questions)

The term “motion” refers to a change in an object’s position concerning time. You will study about different motions in  Class 7 Motion and Time, including why some motions are rapid, and others are slow, how speed is measured, how time is measured, and the different units of speed and time. You’ll also discover how to draw and comprehend a distance-time graph. Apart from all that,   solving some real-life difficulties is also there in the chapter.

The basic unit of time is second. The minute and hour are the larger time units. The second is represented by the letter ‘s’. Though it is the most widely used unit of time, it is not the only one. Other units are also used depending on the situation. 

Speed is defined as the distance a moving item travels in a given amount of time. Its base unit is the metre per second, but fast-moving vehicles’ speeds are sometimes stated in kilometres per hour. Fast-moving items have a high speed, which means they cover more distance in a given amount of time than slow-moving objects.

Metre per second (m/s) is the unit of speed, defined as distance divided by time. Time is measured in seconds, minutes and hours, and distance is measured in kilometres, centimetres, and millimetres. As a result, speed is measured in various ways, including cm/min, km/hr, and so on. These units are only utilised when necessary.

You should start studying the concepts of this chapter thoroughly from the NCERT Science book To understand the chapter in a better manner, you can also practice with the NCERT solution books. There you will get comprehensive answers to the chapter based questions which will further help the students to perform well in their exams.

Getting good grades in this chapter becomes much easier if you understand the numerical part. Students are advised to consult the NCERT solutions provided by Extramarks to grasp the approach of answering problems without difficulty. The questions in the solutions are answered step-wise, with detailed explanations provided for each step. Students can use these solutions to solve textbook problems with ease. To aid students in remembering the formulas during the revision, shortcut techniques and tactics are mentioned in the solutions.

The following topics are covered in Chapter 13 of NCERT for  Class 7 Science: 

  • Slow/Fast – The distance travelled by objects in a given time interval can help us determine which one of them is faster or slower.
  • Speed – The speed of an object can be defined as the distance travelled in a unit of time.
  • Time measurement
  • Speed measurement
  • Time-distance graph