Important Notes for CBSE Class 6 Science Chapter 10 – Motion and Measurement of Distance. Motion and Measurement of Distance Class 6 Notes and Study Material Download in PDF form.
Motion and Measurement of Distance Notes | Motion and Measurement of Distance Class 6 Notes | Motion and Measurement of Distance Quick Revision | Motion and Measurement of Distance Class 6 Quick Revision Notes | Science Class 6 Ch 10 Notes | NCERT Class 6 Science Chapter 10 Notes PDF.
Motion and Measurement of Distance
Distance :
Distance is measurements of how far apartobject of place are.
Measurement :
The fixed known quantity used to measure something is called a unit of measurement. Every measurement consists of two part a number and a unit.
Standard unit of measurement :
A standard unit is a standard or fixed measure of a physical quantity .
Need of standard unit :
- To measure quantities accurately .
- For sake of uniformity.
SI unit :
To avoid confusion and for the sake of uniformity scientists all over the world have accepted a set of standard unit of measurement . This system of unit is used known as the international unit of system ( SI units).
Measuring the length :
The SI unit of length is meter , which is written symbolically (m).
For example : 1km = 1000 meter (m)
Many different instruments can be used to measure a particular physical quantities .
For example : you can not measured waist with a ruler, you must used a measuring tap.
Correct measurement of length :
Using a ruler Correctly :
- Placements of the ruler :
Place the ruler along the length you wish to measure , as close to length as possible .
- Position of the eye:
Your eyes must be exactly above the point where you are making your measurements.
Measuring the length of curved line and edge :
- You can not measured curved line ,or edge by using ruler , but can easily measure by using thread .
- Place a thread with curved point or edge .
- Fixed pin vertically if we measure curved edge of cardboard design , and change direction of thread.
- Make knot at the end of the piece of thread , and fixed the pin at one end of the curved edge.
- And last you can measure this thread by a ruler .
Measuring the mass :
The weight of body is depends on its mass or the amount of matter it contains.
The SI unit of mass is kilograms (kg) .
Motion :
Motion is the phenomenon in which an object changes its position over time.
Types of motion :
- Linear motion :
When the body change Linear motion are two types.
- Rectilinear motion:
When body move in a straight line , its motion is called rectilinear motion.
- Curvilinear motion :
When you filing a ball from the roof of the house the fall follow a curve path , this is called curvilinear motion .
- Rotational motion
When a body move around the centre or axis passing through itself are called rotational motion.
Example : wheels , motor , spinning top etc.
- Circular motion :
When body move around a circular path , its motion are called circular motion.
Example : earth around the sun,
- Oscillatory motion :
The oscillation of a pendulum the movement of swing and the swinging of the bell are example. It is also said the repeated motion itself.
- Periodic motion :
Motion that repeats itself after some period of time is called periodic motion.
Anything that occur at fixed interval of time is called period
Example : the rotation of earth about its axis is repeated every 24 hours , so it is periodic motion.
Story of transportation ;
- Walking :
Transportation occur in older time by walking of human and animals , like horse , elephant , donkey etc.
- Invention of wheel :
Wheel was invented 3500BC ago. The first wheel was made up of wood , wheel were attached to cart and chariots , it is a major invention in transportation.
- Transportation in water:
Transportation in water occur by the boat made up of hollow logs , streamlined shape of boat , boat made up of different wood or Bamboo .
- Steam engine was invented in beginning in 19th century .
- Modern technology transportation .
Aeroplane , electric vehicles , sleeping bus etc.
Motion and Measurement of Distance Class 6 Notes