Section 4 – Mechanics notes
8/1/25
Scalars and vectors
Scalar quantities have only magnitude e.g. distance, time, mass, speed.
Vector quantities have magnitude and direction e.g. velocity, force,
displacement.
Scalar Vector
charge acceleration
speed velocity
distance displacement
current force
time magnetic flux density
mole
temperature
voltage
pressure
resistance
energy
power
volume
15/1/25
Free body and vector diagrams
,Free body diagrams
Diagram of stationary box on table, weight and
normal reaction force shown, and are equal.
Diagram of parachutist with
parachute opened, weight and air
resistance shown, are equal when at
terminal velocity.
Diagram of car driving, weight,
normal reaction force, driving
force and resistive force (air
resistance and
friction) shown. When at constant
speed, driving force and resistive
force are equal.
Vector Diagrams
,
8/1/25
Scalars and vectors
Scalar quantities have only magnitude e.g. distance, time, mass, speed.
Vector quantities have magnitude and direction e.g. velocity, force,
displacement.
Scalar Vector
charge acceleration
speed velocity
distance displacement
current force
time magnetic flux density
mole
temperature
voltage
pressure
resistance
energy
power
volume
15/1/25
Free body and vector diagrams
,Free body diagrams
Diagram of stationary box on table, weight and
normal reaction force shown, and are equal.
Diagram of parachutist with
parachute opened, weight and air
resistance shown, are equal when at
terminal velocity.
Diagram of car driving, weight,
normal reaction force, driving
force and resistive force (air
resistance and
friction) shown. When at constant
speed, driving force and resistive
force are equal.
Vector Diagrams
,
