Motion

Motion: movement occurs when an object has changed positions in space and in time due to the application of forces 

• Internal Force: structures of the body that interact to produce movement 

  • e.g, the action of muscles and tendons that act together to produce forces that cause movement 

• External Force: Interaction between the body and environment 

  • Friction 

  • Gravity  

  • Air resistance 

  • Water resistance  

  • Buoyancy - water 

Linear motion

Movement that is along a straight or curved line, and all body parts move in the same direction at the same speed 
example: ice skater gliding 

Can be rectilinear – occurs through a straight line 

Can be curvilinear where movement is linear but object move through a curved trajectory e.g jumpshot

Angular motion

Where all the parts of a body move through a rotational pathway through the same angle in the same direction at the same time

Anterior-posterior (AP) naval to lower back (e.g performing a cartwheel)

Longitudinal axis – head toe vertically e.g ice skater spinning

Medial lateral hip to hip e.g diver performing a forward somersault

Projectile Motion

Anything that is propelled through the air or water amn affect by only the forces of gravity and air resistance 
 
Gravity: 
- downwards force that rings projectiles back to the ground 

Causes objects to accelerate towards the earth at a rate of 9.91m/s2 and are responsible for giving project 
 
Air Resistance: 
Without air resistance a projectile’s horizontal velocity would remain constant

Important in sports like discus, javelin, and golf. - (less air resistance, further object travels horizontally