week 8 biomechanics Flashcards
exam 2, revision
What is projectile motion?
Projectile motion is motion of objects under the influence of gravity and air resistance.
What characterizes projectile motion when neglecting air resistance?
Projectile motion is characterized by constant horizontal velocity and changing vertical velocity.
Are horizontal and vertical velocities of a projectile dependent or independent?
Horizontal and vertical velocities are independent of each other.
What does Newton’s 1st law state about forces acting on a body?
When no forces act on a body or the net force is zero, the body’s motion remains unchanged.
How do long jumpers use their body position at landing?
Long jumpers adopt a piked position to change the distribution of mass with respect to the center of gravity.
What is the mechanical principle used in high jump technique?
Lowering some parts of the body allows other parts to go higher, improving bar clearance effectiveness.
What factors influence the range of projectiles?
Factors include speed of release, height of release, and angle of release.
What is the optimal release angle for maximum range when release height equals landing height?
The optimal release angle is 45 degrees.
What is the optimal angle of release when the release height is greater than the landing height?
The optimal angle of release is less than 45 degrees.
What is the optimal angle of release when the release height is less than the landing height?
The optimal angle of release is less than 45 degrees.
What were the men’s vertical velocity and take-off angle in the Long Jump at IAAF WC 2017?
Men’s vertical velocity at take-off was 3.9 m/s with a take-off angle of 24°.
What were the women’s vertical velocity and take-off angle in the Long Jump at IAAF WC 2017?
Women’s vertical velocity at take-off was 3.1 m/s with a take-off angle of 21°.
What are the goals of projection other than range?
Goals include maximizing time in the air, minimizing time in the air, optimizing trajectory characteristics, and optimizing trade-offs.
How does air resistance affect projectiles?
Air resistance affects the trajectory and range of projectiles.
What are drag and lift in the context of air resistance?
Drag acts in the direction of airflow and reduces speed; lift acts at right angles to drag.
How do discus and javelin throwers control lift?
They aim to minimize drag while maximizing lift to extend flight time.
What are the main factors affecting projectile motion?
Main factors are release velocity, release height, and release angle.
