1. Measurements Flashcards
1
Q
What is a physical quantity?
A
It can be measured with numerical magnitude and unit
2
Q
What are the 5 base quantities?
A
- length
- mass
- time
- electric current
- temperature
- amount of substance
3
Q
Prefix and their powers
A
Tera (10^12)
Giga (10^9)
Mega (10^6)
Kilo (10^3)
Deci (10^-1)
centi (10^-2)
mili (10^-3)
micro (10^-6)
nano (10^-9)
4
Q
Measurement tools for length
A
- metre rule (nearest 0.1 cm)
- measuring tape (0.1 cm)
- Digital calipers (0.001 cm)
Digital micrometer screw gauge (0.001cm)
5
Q
Measurement for time
A
- stopwatch/clock
- pendulum
6
Q
Scalar quantity only has magnitude. True or false?
A
true
7
Q
What is a vector quantity?
A
Have magnitude and direction
8
Q
What is the difference of displacement and distance?
A
Displacement is the distance travelled from start point to end point only
Distance is the total distance travelled by object
9
Q
Difference of speed and velocity?
A
- Speed is the distance moved per unit time
- Velocity is the rate of change of displacement
