Unit 1: Basic Concepts Flashcards
What are the SI units for length, time, mass, temperature and angle?
Length = metres (m) Time = seconds (s) Mass = kilograms (kg) Temp = Kelvin (K) Angle = radians (rad)
Give 2 examples of derived units
Newtons (N)
Pascals (Pa)
What is the multiplication factor for milli?
10(-3)`
How many radians are in 360 degrees?
2π
How are rectangular coordinates labelled?
In terms of x, y & z axis’ (perpendicular to each other)
Name the 3 planes used to describe the human body?
Sagittal plane
Coronal plane
Transverse plane
When are polar coordinates more useful than rectangular coordinates?
Studies of circular objects and when angles and rotations are important
What are the two forms of motion?
Linear & rotatory
What is the deference between vectors & scalars?
Scalars = magnitude only Vector = magnitude + direction
Define velocity
Rate of change of displacement
Define acceleration
Rate of change of velocity
What 2 effects do forces have on an object?
Change position of object in space + deform the shape of object
Name a simple way of measuring forces
Spring balance
What is a newton in terms of SI units?
1 kgms(-2)
When are bodies considered to be at static equilibrium?
When not moving or moving at a constant velocity (i.e. not accelerating)
What is translational equilibrium?
Static equilibrium along straight lines
What is Newton’s third law?
Every action has an equal & opposite reaction
Define mass
Quantity of matter of which a body is composed
Define weight
Force of grvity acting on a body
What is denisty (p)?
Mass per unit volume (m/v)
What is the equation for weight?
W = mg
What is the relationship between centre of mass & centre of gravity?
Centre of mass = centre of gravity if their is gravity (if no gravity there is only a centre of mass)
Define pressure
Force exerted per unit area (P = F/A)
What are the units of pressure?
Pascals
