Physical Quantities, Units& Measurements Flashcards
What does a physical quantity consists of?
A numerical magnitude and a unit.
What is a physical quantity?
A quantity that can be measured.
What is the name and symbol of unit for the base quantity length?
Metre, m.
What is the name and symbol of unit for the base quantity mass?
kilogram, kg.
What is the name and symbol of unit for the base quantity time?
Second,s.
What is the name and symbol of unit for the base quantity electric current?
Ampere, A.
What is the name and symbol of unit for the base quantity temperature?
kelvin,K.
What is the name and symbol of unit for the base quantity amount of substance?
Mole,mol.
What is the name and symbol of unit for the base quantity luminous intensity?
Candela,cd.
What is the formula for finding area?
Length X width.
What is the formula for finding volume?
Length X width X height.
What is the formula for finding density?
Mass/Volume.
What is the formula for finding speed?
Distance/Time.
What is the formula for finding acceleration?
Change in velocity/Time.
What is the formula for finding force?
Mass X acceleration.
What is the formula for finding pressure?
Force/Area.
What is the formula for finding work?
Force X Distance.
What is the formula for finding power?
Work/Time.
What is the symbol and power of the prefix pico?
p, 10 -12
What is the symbol and power of the prefix nano?
n, 10 -9
What is the symbol and power of the prefix micro?
u, 10 -6
What is the symbol and power of the prefix milli?
m, 10-3
What is the symbol and power of the prefix centi?
c,10-2
What is the symbol and power of the prefix deci?
d,10-1
What is the symbol and power of the prefix kilo?
k,10 3
What is the symbol and power of the prefix mega?
M, 10 6.
What is the symbol and power of the prefix giga?
G,10 9.
What is the symbol and power of the prefix Tera?
T, 10 12.
What is a scalar and name a few examples.
- Physical quantity that only has magnitude.
2. Mass,time, length, energy, density.
What is a vector and name a few examples.
- Physical quantity that has both magnitude and direction.
2. Displacement, velocity, force and momentum.
What is the S1 unit for length?
metre, m.
Which errors should we avoid when using the metre ruler?
- Parallex error
2. End error.
How do we avoid the parallax error?
Line of vision should be perpendicular to the scale.
What is the function of the inside jaws of the vernier calipers?
Measuring internal diameter or length.
What is the function of the outside jaws of a vernier caliper?
Measuring external diameter or length.
What is the tail of a vernier caliper for?
Measuring length.
What is the range of measurement and precision of a measuring tape?
Range: 0-5m
Precision: 0.1cm
What is the range of measurement and precision of a meter ruler?
Range:0-1m
Precision: 0.1cm
What is the range of measurement and precision of a vernier caliper?
Range:0-15cm
Precision: 0.01cm
What is the range of measurement and precision of a micrometer screw gauge?
Range: 0-2.5cm
Precision: 0.01mm
Each division on a micrometer screw gauge represents what distance?
0.50mm/50 = 0.01mm.
What are some precautions we have to take when using the micrometer screw gauge?
- Thimble not tightened too much.
- Clean ends of anvil and spindle.
- Check for systematic error.
What is zero error caused by?
Due to instruments that do not read exactly 0 when there is nothing being measured.
What is used to measure an internal of time?
Stopwatch.
The period T of a pendulum is independent of?
- Amplitude of oscillation
2. Mass of bob
What is an oscillation?
Time for one complete swing(Time where bob passes through middle the second time) of a pendulum
