a catapult
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A catapult is a device used for throwing stones or other projectiles. It uses tension or torsion to store energy and release it rapidly to propel the object. Catapults were historically used in warfare for sieges or to launch projectiles over walls.
A trebuchet typically launches large rocks, projectiles, or other heavy objects over long distances. The projectile is loaded into a sling attached to the throwing arm of the trebuchet, which is then released to launch the projectile towards its target.
The study of projectiles is called ballistics. It involves analyzing the characteristics and behavior of objects in motion, such as bullets, rockets, and other projectiles. Ballistics is used in fields such as forensic science, military technology, and sports science.
A pile of stones is a stack of rocks or stones that have been placed on top of each other. They can serve as markers, memorials, or simply as a way to clear a field.
A projectile is an object that is launched into the air and moves along a curved path under the influence of gravity. The trajectory of a projectile is determined by its initial velocity, angle of launch, and gravitational force acting upon it. Projectiles follow a parabolic path, where the highest point is called the peak or apex. The horizontal and vertical motions of a projectile are independent of each other.
Friction between stones can generate heat due to the resistance that occurs when the stones rub against each other. This heat can build up enough to ignite any flammable material like dry leaves or twigs present between the stones, resulting in a fire.