A concrete bomb is an aerial bomb

Aerial bomb

An aerial bomb is a type of explosive weapon intended to travel through the air with predictable trajectories, usually designed to be dropped from an aircraft...

 which contains dense, inert

Inert

-Chemistry:In chemistry, the term inert is used to describe a substance that is not chemically reactive.The noble gases were previously known as inert gases because of their perceived lack of participation in any chemical reactions...

 material

Material

Material is anything made of matter, constituted of one or more substances. Wood, cement, hydrogen, air and water are all examples of materials. Sometimes the term "material" is used more narrowly to refer to substances or components with certain physical properties that are used as inputs to...

 (typically concrete

Concrete

Concrete is a composite construction material, composed of cement and other cementitious materials such as fly ash and slag cement, aggregate , water and chemical admixtures.The word concrete comes from the Latin word...

) instead of explosive. The target is destroyed using the kinetic energy

Kinetic energy

The kinetic energy of an object is the energy which it possesses due to its motion.It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes...

 of the falling bomb. Such weapons can only practically be deployed when configured as a laser-guided bomb

Laser-guided bomb

A laser-guided bomb is a guided bomb that uses semi-active laser homing to strike a designated target with greater accuracy than an unguided bomb. LGBs are one of the most common and widespread guided bombs, used by a large number of the world's air forces.- Overview :Laser-guided munitions use a...

 or other form of smart bomb

Precision-guided munition

A precision-guided munition is a guided munition intended to precisely hit a specific target, and to minimize damage to things other than the target....

, as a direct hit on a small target is required to cause significant damage. They are typically used to destroy military vehicles and artillery

Artillery

Originally applied to any group of infantry primarily armed with projectile weapons, artillery has over time become limited in meaning to refer only to those engines of war that operate by projection of munitions far beyond the range of effect of personal weapons...

 pieces in urban areas, in order to minimise collateral damage

Collateral damage

Collateral damage is damage to people or property that is unintended or incidental to the intended outcome. The phrase is prevalently used as an euphemism for civilian casualties of a military action.-Etymology:...

 and civilian casualties

Civilian casualties

Civilian casualties is a military term describing civilian or non-combatant persons killed, injured, or imprisoned by military action. The description of civilian casualties includes any form of military action regardless of whether civilians were targeted directly...

.

Guided or unguided concrete bombs may also be used for training pilot

Aviator

An aviator is a person who flies an aircraft. The first recorded use of the term was in 1887, as a variation of 'aviation', from the Latin avis , coined in 1863 by G. de la Landelle in Aviation Ou Navigation Aérienne...

s and ground personnel, due to the advantages of cost (no explosives or fusing), point of impact

Predicted impact point

The predicted impact point is the location that a ballistic projectile is expected to strike if fired. The PIP is almost always actively determined by a targeting computer, which then projects a PIP marker onto a Head-Up Display...

 determination, minimised bombing range

Bombing range

A bombing range is an area used for testing explosive ordnance and practicing to accurately direct them to the target. Bombing ranges are used for munitions that either explode or produce too much destruction to use at a shooting range, such as kinetic energy penetrators or very large caliber...

 damage and safety. Concrete bombs are also used in testing and evaluation of aircraft

Aircraft

An aircraft is a vehicle that is able to fly by gaining support from the air, or, in general, the atmosphere of a planet. An aircraft counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines.Although...

and bombs.