Chapter 2: Foundation Of Physics Flashcards
What are the 3 basic mechanical units?
Mass, Length, Time
What the SI units?
Mass = Kg
Length = m
Time = s
What are the base units?
Kg, m, s, A, K, mol
There are 7 units in total but we do not do luminous intensity
What is a derived unit?
A derived unit is formed by combining one or more of the 7 base units
What is a homogenous equation?
A homogenous equation is one where units on either side are the same. All valid equations of physics are homogenous
What is the difference between a vector quantity and a scalar quantity?
A vector quantity has a magnitude and direction in space
A scalar only has a magnitude
What are some examples of vectors?
Displacement
Velocity
Force
Acceleration
Weight
Momentum
Friction
What are some examples of scalars?
Distance
Area
Volume
Speed
Pressure
Energy
Time
Mass
Density
Power
Frequency
What is a resultant force?
A resultant force is the sum or the combined effect of 2 vector quantities
What is the parallelogram law?
When 2 vectors are joined tail to tail, you complete the parallelogram and the resultant force is the arrow drawn from corner to corner
What is the triangle law?
The law describes when 2 vectors are joined head to tail. You draw the resulting vector by completing the triangle
What can a vector be split into?
A vector of a certain magnitude can be split into 2 perpendicular components
What is the general formula for the horizontal component of a vector?
H = (magnitude)(cos x)
What is the general formula for the vertical component of a vector?
V = (magnitude)(sin x)
