fluid mechanics - lesson 13 Flashcards
define the Magnus effect
the term used to describe the effect of rotation on an object’s path as it moves through a fluid
resultant movement/curve created from spin
what is spin?
created by an eccentric force
when a ball is struck with an eccentric force there is both linear and angular rotation
spin affects both the flight path of a ball and the way is bounces after contact with a surface
what is top spin and the areas of different velocities and pressure?
the ball drops quickly in flight
low velocity, high pressure at top of the ball
high velocity, low pressure at bottom of the ball
the pressure differential causes downwards Magnus force
what is backspin and the areas of different velocities and pressure?
causes ball to stay in the air longer, giving it greater horizontal distance
high velocity, low pressure at top of the ball
low velocity, high pressure at the bottom of the ball
pressure differential creates upwards magnus force
what is side spin?
causes the ball to swerve left or right in flight
what is no spin?
application of a concentric force causes ball to move erratically through the air due to turbulent flow surrounding the ball
how does top spin, no spin and back spin affect the trajectory of the ball?
top spin - shortest distance
no spin - moderate
back spin - furthest distance
