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When making observations with the senses, it means that you can describe the nature or characteristics of the object. However, observations that only use the senses are not enough to provide information to others. For that, you must make observations that can give definite results when communicated to others. For example, you are asked by your mother to buy your sister's shoes that are black, have laces, and are made of cloth. When you arrive at the separu store, you go straight to the place and find the characteristics requested by your mother. However, in that place you feel confused because there are various sizes of shoes. Your mother did not provide information on the correct shoe size for your sister. Finally, you call your mother to ask the right shoe size for your sister. Another example, you are asked by your mother to buy rambutan fruit. How do traders determine the price of the number of rambutan fruits appropriately?
Copy of 7.1.2 Measurement.docxa. Measurements, Quantities and Units
a. Measurements, Quantities and Units
You already know that measuring activities in science are very useful for explaining the characteristics of an object. In addition, you also often jump in measuring activities in everyday life. For example, a carpenter will take a length measurement. or the width of the bench or chair to be made. A trader measures the price of his merchandise to determine the price. For this reason, measuring is a pen activity in life and the main activity in science. You must know the relationship between measurements, quantities, and units.
You and your classmates have done measuring activities. When you measure the length of the study table using the span of your hand, it means that you have compared the length of the study table to the span of your hand. Likewise when you measure the length of the study table using a pencil and notebook. You have compared the length of a study table to that of a pencil and notebook. So, measuring is an activity or process of comparing a quantity being measured.
Base Quantity
Base Quantity
Base quantities are physical quantities that cannot be expressed in relation to other physical quantities. There are seven base quantities in science. They are called SI base units, as in the following table
BASE QUANTITY
BASE QUANTITY
- Length
Length is a measure of distance. The distance between two points or two positions.
Name of unit for the length is metre with the symbol m
Measuring Length
Measuring Length
A ruler or measuring tape can be used to measure length. The SI units to measure length is metre. The metre is defined as the distance travelled by light. It is very important to measure length correctly as an error due to parallax can occur while measuring.
Ruler
Ruler
Vernier Caliper
Vernier Caliper
Vernier caliper is a very useful tool to measure the outer dimension, inner dimension and the depth of an object with a precision of up to 0,01 cm. There are two scales on the Vernier caliper:
main scale has graduated intervals of 0,1 cm
vernier scale can slide on the main scale and has graduated intervals of 0,01 cm.
There are some ways to read Vernier caliper:
To obtain the main scale reading find the value on the main scale which is right before the '0' value on the vernier scale.
To obtain the vernier scale reading, find the value on the vernier scale that is exactly in line with any number on the main scale.
Finally, add both the main scale and vernier scale readings to get the dimension of the object
Copy of SCIENCE - VERNIER CALLIPER INDIVIDUAL ASSIGNMENT.docx
2. Mass
2. Mass
Derived Quantity
Derived Quantity
From these seven base quantities, quantities such as area, volume, density, force, weight and others can be derived. These types of quantities are called derived quantities.
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