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Ever wondered how we can tell how far something moves or how quickly it happens? That is exactly what Class 7 Science Chapter 8 Motion and Time helps you learn. This chapter explains how different objects move, how to measure time accurately and how to calculate speed in easy ways. The NCERT Solutions for class 7 science chapter 8 are prepared to help you to understand these basic concepts easily.
These NCERT solutions for Class 7 Science provide complete answers to all textbook exercises and explain important topics like motion, speed, measurement of time and the Simple Pendulum. With step-by-step explanations, simple language and helpful examples, these NCERT solutions make studying easier and quicker. Along with this a clear method to approach and solve questions is included so you can practice better and perform very well in your school exams.
Below are the detailed exercise solutions for Class 7 Science Chapter 8 is given. These answers are written in a simple and clear manner to help you understand the concepts better and prepare well for your exams.
Q1. Calculate the speed of a car that travels 150 metres in 10 seconds. Express your answer in km/h.
Answer:
Distance
Time taken
Q2. A runner completes 400 metres in 50 seconds. Another runner completes the same distance in 45 seconds. Who has a greater speed and by how much?
Answer:
Runner 1:
Distance
Time
Runner 2:
Distance
Time
Difference
Hence, speed of runner 2 is greater by approximately
Q3. A train travels at a speed of 25 m/s and covers a distance of 360 km. How much time does it take?
Answer:
Q4. A train travels 180 km in 3 h. Find its speed in:
(i) km/h
(ii) m/s
(iii) What distance will it travel in 4 h if it maintains the same speed throughout the journey?
Answer:
Distance
(i) Speed
(ii) Speed in
(iii) Time
Distance
Q5. The fastest galloping horse can reach the speed of approximately 18 m/s. How does this compare to the speed of a train moving at 72 km/h?
Answer:
Speed of horse
Speed of train
The train is faster by
Q6. Distinguish between uniform and non-uniform motion using the example of a car moving on a straight highway with no traffic and a car moving in city traffic.
Answer:
Uniform motion: If an objects covers equal distances in equal distance in equal intervals of time, its motion is said to be uniform. A car moving on a straight highway with no traffic is an example of uniform motion.
Non-uniform motion: If an object covers unequal distances in equal interval of time, its motion is said to be non-uniform. A car moving in a traffic is an example of nonuniform motion.
Q7. Data for an object covering distances in different intervals of time are given in the following table. If the object is in uniform motion, fill in the gaps in the table.
Answer:
In uniform motion, object covers equal distances in equal intervals of time. Hence, the speed of an object remains constant throughout the motion.
The object covers 8 m in every 10 seconds. Hence, the speed of an object remains constant at 0.8 m/s throughout the motion.
Q8. A car covers 60 km in the fi rst hour, 70 km in the second hour, and 50 km in the third hour. Is the motion uniform? Justify your answer. Find the average speed of the car.
Answer:
The car covers different distances in each hour. Hence, the motion of the car is nonuniform.
Total distance
Total time
Hence, the average speed of the car is
Q9. Which type of motion is more common in daily life — uniform or non-uniform? Provide three examples from your experience to support your answer.
Answer:
In our daily life, most motions are nonuniform because object do not move at the same speed all the time. Their speed changes due to factors like traffic, rough or uneven roads and other obstacles.
Examples:
• Travelling in a bus on an uneven road
• Playing cricket
• Walking through a crowded market
Q10. Data for the motion of an object are given in the following table. State whether the speed of the object is uniform or non-uniform. Find the average speed.
Answer:
The object exhibits non-uniform motion, because it covers
Q11. A vehicle moves along a straight line and covers a distance of 2 km. In the fi rst 500 m, it moves with a speed of 10 m/s and in the next 500 m, it moves with a speed of 5 m/s. With what speed should it move the remaining distance so that the journey is complete in 200 s? What is the average speed of the vehicle for the entire journey?
Answer:
Given
Total distance
Total time
Step 1: Time taken to cover the first 500 m
Step 2: Time taken to cover the next 500 m
Step 3: Remaining distance
Step 4: Speed required to cover the remaining 1000 m
Step 5: Average speed
Below are the important topics covered in Class 7 Science Chapter 8 Motion and Time. These topics will help you understand different types of motion, how to measure time, and calculate speed accurately
8.1 Measurement of Time
8.1.1 A simple pendulum
8.1.2 SI unit of time
8.2 Slow or Fast
8.3 Speed
8.4 Uniform and Non-uniform Linear Motion
To solve questions from Class 7 Science Chapter 8 start by identifying what the question is asking whether it is about measuring time, calculating speed, or identifying types of motion. For most of the numerical problems, use the formula:
Speed
Make sure all values are in the correct SI units (distance in meters, time in seconds, and speed in m/s ). For concept based questions, recall important terms like uniform motion non-uniform motion, and a simple pendulum.
In addition to the Class 7 Science chapter 8 question answer, students can access comprehensive chapter-wise solutions for Class 7 Science by clicking the link provided below:
The NCERT curriculum Class 7 Science covers various chapters such as nutrition, heat transfer, plant reproduction, motion, and electric current, with exercises and activities to make learning interactive.
You can follow the Science textbook for Class 7 NCERT which is designed according to the CBSE syllabus and covers all important scientific concepts in simple language with examples.
Some devices we can use to measure time are clocks, watches, stopwatches, sundials, water clocks, and sand timers.
Yes, a swing moves back and forth on a regular basis and is a type of periodic motion, just like a simple pendulum
Not really. Speed is mainly dependent upon the force applied to the object and the surface it is travelling on. A heavy object might travel slower if not enough force is applied.
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