9 Measurements Lessonplan Hema

# June

## Instructional objectives

• Need for measurements.
• Differentiate basic physical quantities and Derived physical quantities
• Need for expressing physical quantities with their respective units.
• Concept of least count.
• Vectors and scalar quantities.
• Meaning of prefixes like kilo, centi, milli, micro, nano
• Use of slide calipers and screw gauge for measurement.(lab activities)

## Teaching process

• Talk about need for measurement. How do you quantify various physical quantities and need for units of measurement.
• Need for accuracy of measurements and introduce least count.
• Students to be given different instruments to find least counts of the same.
• Physical quantities to be differentiated as fundamental and derived. Appreciate significance of derived physical quantities
• To introduce vector and scalar quantities and elaborate on the significance of both magnitude and direction.
• Talk about limitations of basic instruments (like a scale) and importance of accuracy.
• Introduce Slide calipers and screw gauge.
• Students to calculate the least count of the above .
• To enable students to use the above to find diameter(both external and internal) of a wire, pipe etc.

++Assignments

• worksheets to be provided to solve numerical problems concerning screw gauge. ( Shall be enclosed as and when prepared).
• Test shall be planned by the end of the month for evaluation.

## Special needs modification.

• Suggest youtube videos on measurements.
• Modified worksheets to be given.