Linear & Angular Kinetics
This branch of biomechanics describes when the sum of all forces equals zero, resulting in no motion.
What is statics?
During cutting or landing, controlling the position of this relative to the base of support is critical for balance and injury prevention.
What is center of mass?
During collision, two athletes exert equal and opposite forces on each other, yet one experiences greater acceleration due to lower mass explaining this law.
What is Newton's 2nd and 3rd Laws of Motion?
At the apex of a jump, acceleration is equal to this value.
What is 9.81 m/s^2?
Poor control of joint motion during high-force movements increases stress on passive structures, raising the risk of this outcome.
What is injury?
An athlete increases torque and moment of inertia proportionally. This rotational variable will not change.
What is angular acceleration?
A gymnast rotates counterclockwise in the air around their longitudinal axis. While rotating, the gymnast may do this to decrease their moment of inertia.
What is pull their limbs closer to the axis of rotation to reduce the distance their mass is distributed?
A change in a system's total momentum is the result of this acting on the system.
What is impulse?
An athlete appears to "float" longer in the air, but gravity has not changed. The difference is explained entirely by this variable?
What is takeoff velocity?
This force is undefeated and has a 100% success rate at bringing athletes back to the ground.
What is gravity?
Rate of change of position describes this biomechanical term.
An athlete improves their ability to rapidly produce force without increasing maximal strength. This kinetic quality has improved.
What is rate of force development?
What is direction (or force vector orientation)?
A heavier athlete falls faster because gravity pulls harder on them. (true or false, and why)
What is false because all objects accelerate at the same rate due to gravity?
This increases when you hold a weight farther from your body, also known as making life unnecessarily harder.
What is moment of inertia?
To decrease moment of inertia if mass is constant you must manipulate this.
What is distance from the axis of rotation?
As contraction velocity increases, the ability to produce force decreases due to this relationship.
What is the force-velocity relationship?
This factor limits the amount of force an athlete can apply when force needs to be applied quickly.
What is time?
Ignoring air resistance, all objects in free fall accelerate at the same rate regardless of this property.
What is mass?
If you run faster while being chased by a dog with rabies, this variable decreases as you speed up.
What is ground contact time?
An athlete cuts GCT in half, but maintains the same impulse. To maintain the same velocity, the must change this variable by this much.
What is force, and it must double?
During a CMJ, an athlete may use their arms contributing to this variable?
What is vertical momentum?
An athlete sprinting at max speed, applying as much force as efficiently as possible can only increase this component to further increase speed.
What is stride frequency?
What is gravitational potential energy?
Isaiah drops his phone but swears Zach bumped into him. This is to blame.
What is gravity?