Chapter 4 - Linear Kinematics Flashcards
What is Kinematics?
- The pattern or sequencing of movement wrt time
- The appearance of motion
- Visually observable aspects of technique or form
What is Linear Displacement?
The distance between initial and final location (Change in location)
What is Linear Speed?
Distance covered over a period of time.
Hence, Speed = Distance / Time
What affects your Running Speed?
1) Stride Length
2) Stride Frequency
What is Linear Velocity?
- The rate of change in location
- Hence, Velocity = Displacement / Time
Has Direction
What is Acceleration?
- The rate of change in linear velocity
- Hence, Acceleration = Change in velocity / Time
or (Acceleration = v2-v1 / Time)
Can Acceleration be negative and positive?
Yes, Depending on the direction
What is a Projectile?
- A body in free fall that is subjected only to the forces of gravity and air resistance.
- Vertical component influenced by gravity while horizontal component is not
What is the effect of gravity?
(For Your Information)
Force of gravity produces a constant acceleration of -9.81m/s^2 on bodies near the surface of the earth
What are the factors that influence the trajectory of a projectile?
1) Projection Angle
2) Projection Speed
3) Relative Projection Height
What is projection angle?
The direction of projection with respect to the horizontal
(For example, projection angle is particularly important in shooting a basketball. A common error among novice players is shooting the ball with too flat a trajectory.)
What is projection speed?
The magnitude of projection velocity
(For example, the instantaneous velocity of the shot at the moment of release primarily determines the ultimate horizontal displacement of the shot.)
What is relative projection height?
The difference between projection height and landing height
What are the three equations of constant acceleration?
1) v2 = v1 + at
2) d = v1/t + 1/2 at^2
3) v2^2 = v1^2 + 2ad
