Biomechanics lecture 2 - Angular Kinematics

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Biomechanics lecture 2 - Angular Kinematics

1. Described motion

1.1. curvilinear

1.1.1. projectiles

1.1.2. not rotating around an axis

1.2. Angular

1.2.1. rotates around an axis

2. Projectile motion

2.1.1. human

2.1.2. animal

2.1.3. ball

2.2. forces

2.2.1. gravity

2.2.1.1. 9.807 m/s²

2.2.1.2. gravity is a uniform downward acceleration

2.2.2. air resistance

2.3. sports

2.3.1. prior to release

2.3.1.1. prior to release the flight pattern can be influenced

2.3.2. after release

2.3.2.1. it has a uniform downward acceleration due to gravity

2.4. kinematic equations

2.4.1. without time

2.4.1.1. Vf^2 = Vi^2 + 2*a*d

2.4.2. without distance

2.4.2.1. Vf = Vi + a*t

2.4.3. without final velocity

2.4.3.1. d = vi * t + (1/2) *a*t²

2.4.4. acceleration

2.4.4.1. a = 9.81m/s²

3. Projectile

3.1. 3 factors that influence

3.1.1. initial velocity (Vi)

3.1.2. angle of protection

3.1.2.1. Vx (the horizontal) is not influenced by gravity

3.1.2.2. Vy (the vertical) is influenced by gravity. Vy= Vi sinθ

3.1.3. height

4. Tangent

4.3. to increase tangential velocity, you must increase the radius. therefore increase the limb (racket, bat)

4.4.1. the distance between the centre of the rotation and the motion

5. angular kinematics

5.1. descriptors

5.1.1. angular distance

5.1.1.1. scalar

5.1.2. angular displacement

5.1.2.1. vector

5.1.3. angular speed

5.1.3.1. degrees per second

5.1.4. velocity

5.1.4.2. degrees per second

5.1.5. angular acceleration

5.1.5.1. degrees per second²

6. equations

6.1. angular velocity

6.1.1. angular distance / time

6.2. angular acceleration

6.2.1. change in angular velocity / time

7. Angular positioning

7.1. relative

7.1.1. angle between 2 segments

7.2. absolute

7.2.1. relative to the plane of motion. horizontal or vertical