Biomechanics lecture 1

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Biomechanics lecture 1 by Mind Map: Biomechanics lecture 1

1. Describing motion

1.1. linear motion

1.1.1. translation all points in a line and have the same speed and direction

1.1.2. rectal linear straight line

1.1.3. curvilinear all points travel at the same angle and speed, but are not around an axis. curved line

1.1.4. general combination of rectal linear and curvilinear

2. Quantify motion

2.1. coordinate system

2.1.1. cartesian

3. Kinematic descriptors

3.1. scalar

3.1.1. distance

3.1.2. has magnitude but no direction

3.1.3. speed rate of motion without direction distance / time

3.2. vector

3.2.1. velocity rate of change of position but also includes magnitude and direction displacement / time

3.2.2. displacement

3.2.3. acceleration change in velocity / time

3.2.4. has magnitude and direction

4. Average speed

4.1. doesn't tell you

4.1.1. distance traveled

4.1.2. what happened during

4.1.3. what the top speed was

4.1.4. how long to get to the top speed

4.1.5. how long top speed was maintained for

5. Usain Bolt and Tyson Gaye race

5.1. broken into 4 segments

5.1.1. every 10m looked at instantaneous velocity displacement / time interval number of steps stride rate angel of shin and torso and and how these changed

6. Training for acceleration

6.1. you should be looking at training to get a higher top speed to improve acceleration

7. Biomechanics lecture 2 - Angular Kinematics

7.1. Described motion

7.1.1. curvilinear projectiles not rotating around an axis

7.1.2. Angular rotates around an axis

7.2. Projectile motion

7.2.1. the motion of any body both animate or inanimate that is in free fall that has been dropped or protected human animal ball

7.2.2. forces gravity 9.807 m/s² gravity is a uniform downward acceleration air resistance

7.2.3. sports prior to release prior to release the flight pattern can be influenced after release it has a uniform downward acceleration due to gravity

7.2.4. kinematic equations without time Vf^2 = Vi^2 + 2*a*d without distance Vf = Vi + a*t without final velocity d = vi * t + (1/2) *a*t² acceleration a = 9.81m/s²

7.3. Projectile

7.3.1. 3 factors that influence initial velocity (Vi) angle of protection Vx (the horizontal) is not influenced by gravity Vy (the vertical) is influenced by gravity. Vy= Vi sinθ height

7.4. Tangent

7.4.1. motion around an axis of rotation

7.4.2. tangent velocity = angular velocity * the radius

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

7.4.4. radius the distance between the centre of the rotation and the motion

7.5. angular kinematics