Kinematics Flashcards
Displacement of a point
Displacement of an object is its distance from a fixed point in a specific direction.
Velocity
The rate of change of body’s displacement
Acceleration
The rate of change of a body’s velocity
formula for v
u + at
Formula for s
½(u+v)t
ut+½a(t)^2
Formula for v^2
u^2 + 2as
Low speeds with no turbulence
F = kv
High speeds with turbulence
F = kv^2
Why does an object reach a constant velocity?
When the object is dropped, air resistance which acts opposite to the object’s motion increases as speed of object increases.
The resultant force on the object (diff between weight and air resistance) decreases as the object falls.
When magnitude of air resistance is equal to the objects weight, resultant force becomes zero, and object reaches constant velocity.