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Τι (ποιος) είναι collisions - ορισμός
PHYSICAL EVENT WHERE TWO OR MORE BODIES EXERT FORCES ON EACH OTHER FOR A SHORT TIME
Colliding; Collisions; Closing speed; Jostle; Collision of bodies; 💥; Allision
![Deflection]] happens when an object hits a plane surface. If the kinetic energy after impact is the same as before impact, it is an elastic collision. If kinetic energy is lost, it is an inelastic collision. The diagram does not show whether the illustrated collision was elastic or inelastic, because no velocities are provided. The most one can say is that the collision was not perfectly inelastic, because in that case the ball would have stuck to the wall.](https://commons.wikimedia.org/wiki/Special:FilePath/Deflection.png?width=200 "Deflection]] happens when an object hits a plane surface. If the kinetic energy after impact is the same as before impact, it is an elastic collision. If kinetic energy is lost, it is an inelastic collision. The diagram does not show whether the illustrated collision was elastic or inelastic, because no velocities are provided. The most one can say is that the collision was not perfectly inelastic, because in that case the ball would have stuck to the wall.")
collision
(collisions)
1.
A collision occurs when a moving object crashes into something.
They were on their way to the Shropshire Union Canal when their van was involved in a collision with a car...
I saw a head-on collision between two aeroplanes.
= crash
N-VAR: oft N with/between n
2.
A collision of cultures or ideas occurs when two very different cultures or people meet and conflict.
The play represents the collision of three generations.
= clash
N-COUNT: oft N of/between/with n
collision
n.
1) to cause a collision
2) a head-on; midair collision
3) a near collision
4) a collision between; with (the collision between the ships was caused by fog)
Collision
·noun A state of opposition; antagonism; interference.
II. Collision ·noun The act of striking together; a striking together, as of two hard bodies; a violent meeting, as of railroad trains; a clashing.
Βικιπαίδεια
Collision
In physics, a collision is any event in which two or more bodies exert forces on each other in a relatively short time. Although the most common use of the word collision refers to incidents in which two or more objects collide with great force, the scientific use of the term implies nothing about the magnitude of the force.
Some examples of physical interactions that scientists would consider collisions are the following:
- When an insect lands on a plant's leaf, its legs are said to collide with the leaf.
- When a cat strides across a lawn, each contact that its paws make with the ground is considered a collision, as well as each brush of its fur against a blade of grass.
- When a boxer throws a punch, their fist is said to collide with the opponents body.
- When an astronomical object merges with a black hole, they are considered to collide.
Some colloquial uses of the word collision are the following:
- A traffic collision involves at least one automobile.
- A mid-air collision occurs between airplanes.
- A ship collision accurately involves at least two moving maritime vessels hitting each other; the related term, allision, describes when a moving ship strikes a stationary object (often, but not always, another ship).
In physics, collisions can be classified by the change in the total kinetic energy of the system before and after the collision:
- If most or all of the total kinetic energy is lost (dissipated as heat, sound, etc. or absorbed by the objects themselves), the collision is said to be inelastic; such collisions involve objects coming to a full stop. An example of such a collision is a car crash, as cars crumple inward when crashing, rather than bouncing off of each other. This is by design, for the safety of the occupants and bystanders should a crash occur - the frame of the car absorbs the energy of the crash instead.
- If most of the kinetic energy is conserved (i.e. the objects continue moving afterwards), the collision is said to be elastic. An example of this is a baseball bat hitting a baseball - the kinetic energy of the bat is transferred to the ball, greatly increasing the ball's velocity. The sound of the bat hitting the ball represents the loss of energy.
- And if all of the total kinetic energy is conserved (i.e. no energy is released as sound, heat, etc.), the collision is said to be perfectly elastic. Such a system is an idealization and cannot occur in reality, due to the second law of thermodynamics.
Παραδείγματα από το σώμα κειμένου για collisions
1. "It‘s through collisions that planets are born," he said, "and through collisions that planets die."
2. "We treat fatal collisions, particularly failing–to–stop collisions as the scene of a serious crime." The inquest continues.
3. "I‘ve witnessed enough near collisions," she said.
4. Otherwise, collisions would occur in outer space.
5. Unexpected collisions breathe life into the overfamiliar.