magnus + spin Flashcards
Creation of the idea of magnus force
Followed Bernoulli + applied fluid mechanics to spinning/ rotating projectiles
What is the Magnus effect?
Creation of an additional Magnus force on a spinning projectile which deviates from the flight path
What is magnus force?
A force created from a pressure gradient on opposing surfaces of a spinning body moving through the air
How is spin created?
Applying an external force outside COM- non parabolic
how is topspin generated, direction of magnus force + flight path?
- eccentric force applied above CoM
- downwards magnus force
- shortened flight path
topspin diagram
How is topspin used in sport?
- hit ball harder ensuring it still lands in court
- confuse the opponent bringing them closer to the net + put them in defensive position
how is backspin generated, direction of magnus force + flight path?
- eccentric force below CoM
- upwards magnus force
- lengthening flight path
backspin diagram
how is sidespin hook generated, direction of magnus force + flight path?
- eccentric force applied right of CoM
- left magnus force
- swerves left
sidespin hook diagram
how is sidespin slice generated, direction of magnus force + flight path?
- eccentric force applied left of CoM
- right magnus force
- swerves right
sidespin slice diagram
the way the projectile spins determines…
The way the projectile spins determines the direction, velocity + pressure of airflow around it
magnus force of a ball with topspin is created by? (3)
- upper surface of a projectile rotating towards the oncoming airflow, opposes motion creating a high pressure zone due to decreased velocity of airflow
- lower surface of projectile rotating in the same direction as airflow increasing velocity of airflow creating a zone of low pressure
- pressure gradient forming + additional magnus force created downwards
Sidespin use in sport
- swerve in flight to move around obstacles e.g golf + football
- confuse opponent moving them to other side of court
diagram tips
- wherever the eccentric force is applied, e.g. top/over com, that’s where there is highest pressure + low velocity - applies for all diagrams
- magnus force arrow always goes from high pressure to low pressure
- arrows of airflow oppose direction of travel
- when the arrow around the circle is going in the same direction as the direction of airflow, pressure is lower
