Measurements

Question 1

What is physics?

Answer 1

physics is a branch of science that uses quantitative measurements to enhance sound Knowledge of the effects on interactions of matter with One another.

Question 2

What was physics called on its early stage?

Answer 2

Physics on its early stage was called Natural Philosophy .

This is because of the superior knowledge applied in to explain natural interactions of matter.

Question 3

Reasons for separation of physics from philosophy

Answer 3

1. insistence on quantitative measurements that have units and experimental details involved in physics as a science.
2. Physical quantities are therefore , expressed in quantities that have units and dimension

Question 4

Who was the first person to emphasized the importance of measurements. In science and engineering?

Answer 4

LORD KELVIN

Question 5

What are the building block or physical quantities

Answer 5

1. Forces
2. Time
3. Velocity
4. Density
5. Temperature
6. Magnetic susceptibility
7. Heat conductivity

Question 6

Divisions of building block or physical quantity.

Answer 6

1. Fundamental quantity
2. Derived

Question 7

Define Derived quantity

Answer 7

Derived quantity are those that can be given as the function of the fundamental quantity.

Question 8

Examples of derived quantity

Answer 8

1. Velocity
2. Volume
   3.acceleration
3. Force
4. Pressure
5. Weight

Question 9

Reason there is no existence of absolute frame of reference.

Answer 9

This is because, there is no particle at rest.

Question 10

Define Inertia reference frame

Answer 10

This is the bodies in reference frame moving with uniform velocity with respect to each and with respect to the fixed stars.

Question 11

First truly International Standard of length?

Answer 11

Platinum_Iriduim alloy called standard meter

Question 12

Features of standard meter

Answer 12

1. The distance between two fine lines engraved on gold plug near the end of the bar Was defined as ONE METER
2. the bar is said to be at 0.00c and supported mechanically in a prescribed way.

3.it was agreed that the meter was to be the one millionth of the distance from pole to equator along the meridian line through parish France.

Question 13

Characteristics of the conventional present day Meter.

Answer 13

1. It was made in error of about 0.023% of the intended value such that it is no longer one millionth of the distance from the pole to the equator along the said meridian.

2.The error does not introduce any problem in measurement.
the important thing is that it has become standard value.