Reading engineering drawings Flashcards
What is scientific notation?
A way of writing very big or very small numbers
It is also known as standard form.
What is the general form of scientific notation?
m × 10^n where m is between 1 and 10 and n is any whole number
Example: 52 km = 5.2 × 10^4 m
What is an SI unit?
A globally recognised standard for expressing quantities and a fundamental unit
It cannot be broken down into other units.
What is the International System of Units (SI)?
The international standard for measurement, commonly known as the metric system
Established by the International Treaty of the Metre in 1875.
How many fundamental or base units are there in the SI system?
Seven
These units form the basis for all other units.
What is a base unit?
A unit defined on its own terms upon which other units are based.
Can you name SI base units?
- Mass: kilogram (kg)
- Length: metre (m)
- Time: second (s)
- Current: ampere (A)
- Amount of substance: mole (mol)
- Thermodynamic temperature: kelvin (K)
- Luminous intensity: candela (cd)
How is momentum calculated?
Momentum = mass x velocity
Formula: p = m x v
What is the unit of momentum?
Kilogram metres per second (kg m/s)
Represents the product of mass and velocity
How is pressure calculated?
Pressure = force ÷ area
Formula: p = F ÷ A
What does pressure measure?
The force applied per unit area
Determines the effect of a force on a surface
What is the unit of pressure?
Pascal (Pa)
Standard unit for measuring pressure
What is the formula for speed?
Speed = distance ÷ time
Formula: s = d ÷ t
What is acceleration?
The rate of change of velocity of an object
Velocity is speed in a particular direction
What is the formula for acceleration?
Acceleration = change in velocity ÷ time
Formula: a = (v - u) ÷ t
What does force represent?
The push or pull on an object that causes it to change velocity
Acts upon an object with mass
What does Newton’s Second Law of Force state?
The acceleration of a body is proportional to the resultant force and in the same direction
Relates force, mass, and acceleration
What is the unit of force?
Newton (N)
Standard unit for measuring force
What is the formula for force?
Force = mass x acceleration
Formula: F = m x a
