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Projectile Motion

Projectile Motion

An object thrown in the air follows a parabolic path under the influence of Earth's gravitational force. The motion of such an object is called projectile motion, and the object itself a projectile. The parabolic path followed by the projectile is called the trajectory. Some common examples of projectile motion are the launching of fireworks, a golf ball in the air, meteors entering the Earth's atmosphere, and the firing of bullets.
When an object falls under gravity and has no horizontal...

Projectile Motion: Example

Projectile Motion: Example

The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw their javelin in such a way that it travels as far as possible. The javelin thrower takes a short run-up to increase the initial speed of the javelin. The range of a projectile is at its maximum at a 45° angle so javelin throwers try to angle their throw as close to 45° as possible.
When we speak of the range (R) of a projectile on level...

Impact: Problem Solving

Impact: Problem Solving

In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...

Motion of a Projectile

Motion of a Projectile

Projectile motion becomes evident when a player kicks the ball into the air. The launch angle, or the angle at which the ball is kicked, plays a crucial role in determining the trajectory of the projectile. As the ball soars through the air, influenced solely by gravity, its motion can be dissected into two independent velocity components: the horizontal and the vertical.
Horizontal motion, governed by the initial kick, maintains a constant velocity throughout the flight of the soccer ball.

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Building an Enhanced Flight Mill for the Study of Tethered Insect Flight

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A new ball launching system with controlled flight parameters for catching experiments.

A d'Avella¹, B Cesqui, A Portone

¹Laboratory of Neuromotor Physiology, Santa Lucia Foundation, via Ardeatina 306, 00179 Rome, Italy. a.davella@hsantalucia.it

Journal of Neuroscience Methods

|January 25, 2011

Summary

Researchers developed a novel apparatus to precisely control projectile motion, enabling systematic studies of sensorimotor control in naturalistic tasks like catching. This system accurately manipulates ball flight, even with air drag, advancing the study of human interception.

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Area of Science:

Biomechanics
Neuroscience
Robotics

Background:

Investigating sensorimotor control of interceptive actions requires precise control over projectile flight parameters.
Air drag complicates analytical computation of launch into flight parameters, posing a challenge for naturalistic studies.

Purpose of the Study:

To design, calibrate, and validate an actuated launching apparatus for controlled projectile motion in 3D space.
To enable systematic investigations of sensorimotor control in naturalistic interceptive tasks, accounting for air drag.

Main Methods:

An actuated launching apparatus was developed, integrating a ball launcher with an adjustable orientation structure.
A motion capture system and polynomial functions were used for apparatus calibration and mapping launch to flight parameters.
660 launches across 65 initial conditions were used to obtain polynomial coefficients for parameter estimation.

Main Results:

The apparatus demonstrated high relative accuracy (>98% for flight times) and precision (>96% for ball heights) at 6m.
The system reliably controlled average spatial position and flight duration of projectiles, neglecting air drag effects.

Conclusions:

The novel apparatus provides reliable, automated control of ball flight characteristics, including air drag.
This enables systematic investigation of naturalistic interceptive tasks, advancing understanding of sensorimotor control.