Posted by In Chapter 7 of RBSE Class 6 Science, titled “Motion and Measurement of Distances,” students are introduced to the fundamental concepts of motion, how it is measured, and the units used for measuring distance and time. This chapter also explains the types of motion and how different tools and instruments are used to measure distances accurately. Understanding motion is essential as it forms the basis of many physical phenomena we observe in daily life.
Table of Contents
RBSE Solutions for Class 6 Science Chapter 7 – Motion and Measurement of Distances Exercise Questions
1. Give two examples each, of modes of transport used on land, water and air.
Solution:
Land – Train, Bus
Water – Ship, Boat
Air – Helicopter, Aeroplane
2. Fill in the blanks:
(i) One metre is ______________ cm.
(ii) Five kilometre is ______________ m.
(iii) Motion of a child on a swing is ______________.
(iv) Motion of the needle of a sewing machine is ______________.
(v) Motion of wheel of a bicycle is______________.
Solution:
(i) One metre is 100 cm.
(ii) Five kilometres is 5000 m.
(iii) Motion of a child on a swing is periodic.
(iv) Motion of the needle of a sewing machine is periodic.
(v) Motion of the wheel of a bicycle is circular.
3. Why can a pace or a footstep not be used as a standard unit of length?
Solution:
Pace or a footstep cannot be used as a standard unit of length because it varies from person to person.
4. Arrange the following lengths in their increasing magnitude: 1 metre, 1 centimetre, 1 kilometre, 1 millimetre.
Solution:
1 millimetre, 1 centimetre, 1 metre, 1 kilometre
5. The height of a person is 1.65 m. Express it into cm and mm.
Solution:
1.65= 165 cm = 1650 mm
6. The distance between Radha’s home and her school is 3250 m. Express this distance in km.
Solution:
1km = 1000 m
Hence, 3250 m = 3.25 kms
7. While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?
Solution:
Length of needle = 33.1 – 3 = 30.1 cm
8. Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.
Solution:
Similarities – The blades of a fan and the wheels of a bicycle show circular motion
Differences – Bicycles move in rectilinear motion, but the fan does not move in rectilinear motion.
9. Why would you not like to use a measuring tape made of an elastic material like rubber to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with such a tape?
Solution:
An elastic measuring-tape will not give accurate measurements as it stretches in length and reduces in size when stretched. When we express measurements taken with elastic tape, we have to tell whether the tape was stretched. If yes, how much? Hence, it is very difficult to tell the measurement taken from an elastic tape.
10. Give two examples of periodic motion.
Solution:
a) A needle of a sewing machine
b) Pendulum
Key Topics Covered in Chapter 7: Motion and Measurement of Distances
- Introduction to Motion
- Motion is the change in the position of an object over time. It can be observed in various forms, such as the movement of cars, falling objects, or moving animals.
- Types of Motion
- Rectilinear Motion: Motion along a straight line, such as a car moving on a straight road.
- Circular Motion: Motion along a circular path, such as the motion of the hands of a clock.
- Periodic Motion: Motion that repeats itself after regular intervals, such as the swinging of a pendulum.
- Random Motion: Motion where the path is unpredictable, such as the movement of a butterfly.
- Measuring Distances
- Units of Measurement: The standard unit of length in the metric system is meter (m). Other units include centimeter (cm) and kilometer (km).
- Instruments for Measuring Distances: Various tools like rulers, measuring tapes, and odometers are used to measure distance depending on the size and nature of the object or area.
- Ruler: For measuring small lengths.
- Measuring Tape: For measuring longer distances like the height of a building.
- Odometer: For measuring distances traveled by vehicles.
- Measuring Time
- Time is usually measured using a clock or watch. The standard unit of time is the second (s), and larger units like minute (min) and hour (h) are also used.
- Speed is defined as the distance traveled per unit of time. It is calculated by dividing the distance by time.
- Speed and its Calculation
- Speed Formula: Speed=DistanceTime\text{Speed} = \frac{\text{Distance}}{\text{Time}}Speed=TimeDistance
- The unit of speed is meters per second (m/s), although kilometers per hour (km/h) is also commonly used for vehicles.
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RBSE Class 6 Science Chapter 7 Solutions
Q1. What is motion?
- Answer: Motion is the change in the position of an object with respect to time.
Q2. What are the different types of motion?
- Answer: The different types of motion are:
- Rectilinear Motion: Motion along a straight line.
- Circular Motion: Motion along a circular path.
- Periodic Motion: Motion that repeats after regular intervals.
- Random Motion: Motion where the path is unpredictable.
Q3. What is the standard unit of length?
- Answer: The standard unit of length is meter (m). Other units like centimeter (cm) and kilometer (km) are also used.
Q4. How do we measure long distances?
- Answer: Long distances are measured using instruments like measuring tapes or odometers. A measuring tape is used for measuring distances on land, while an odometer is used in vehicles to measure the distance traveled.
Q5. What is the formula for speed?
- Answer: The formula for speed is: Speed=DistanceTime\text{Speed} = \frac{\text{Distance}}{\text{Time}}Speed=TimeDistance Speed is usually measured in meters per second (m/s) or kilometers per hour (km/h).
FAQs for RBSE Class 6 Science Chapter 7
1. What is the difference between speed and velocity?
Speed refers to how fast an object moves, while velocity also considers the direction of motion. Speed is a scalar quantity, and velocity is a vector quantity.
2. How is the distance measured in vehicles?
- The distance traveled by vehicles is measured using an odometer, which records the distance covered by the vehicle’s wheels.
3. What is periodic motion?
- Periodic motion is the type of motion that repeats itself after fixed intervals of time. An example is the motion of a pendulum in a clock.
4. What tools are used for measuring small distances?
- Small distances are measured using a ruler or measuring scale.
5. How can we calculate the speed of a moving object?
- To calculate the speed, divide the distance traveled by the time taken. The formula is: Speed=DistanceTime\text{Speed} = \frac{\text{Distance}}{\text{Time}}Speed=TimeDistance
Conclusion
Chapter 7 of RBSE Class 6 Science provides a fundamental understanding of motion and how we measure distances and time. By learning about the different types of motion, the tools used for measurement, and the concept of speed, students can relate to the motion around them in daily life. This chapter sets the groundwork for further studies in physics, where motion and measurement play an essential role in various fields of science and engineering.