How do you distinguish between elastic and inelastic collision?


V=m sub 1 u sub 1 + m sub 2 + u sub 2 / m sub 1 + m sub 2
Iadd molang ang V1+V2

In Activity 9 "Bouncy Ball", the objective is to classify a collision as perfectly elastic, slightly inelastic, moderately inelastic,  highly inelastic, or perfectly inelastic.

The students have 4 to 5 different balls and the student should tell which ball is elastic and not elastic or inelastic.

The type of balls prepared by the students are rubber, cotton, plastic, and clay, marble.

The type of surface prepared by the students are concrete, wood, grass.


Which ball is generally more elastic?

Rubber ball

Which surface is generally more elastic?

Concrete surface

Was there an elastic collision?

Yes, using the rubber ball bounce in the concrete surface.

Elastic collision one in which the total kinetic energy of the system  does  not change and colliding objects bounce off after collision.

Was there a perfectly inelastic collision?

Yes, using the clay ball bouncing in wood and concrete surfaces.

In inelastic collision, the total kinetic energy of the system  was not conserve which means, it is converted to some other forms of energy such as, sound energy, internal energy, and heat energy because of fusion. If  the objects stick together after collision, it considered as perfectly inelastic collision.

If no external force present momentum is conserved but kinetic energy in inelastic collision will not be conserved :

total momentum before collision = total momentum after collision

A collision is an encounter between two objects resulting in exchange of impulse and  momentum. Because the time of impact is usually small, the impulse provided by external  forces like friction during this time is negligible. If we take the colliding bodies as one system,  the momentum of the system is therefore approximately conserved.  The total momentum of the system before the collision is equal to the total  momentum of the system after the collision.


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which of the following statement is true?

A.An object with the small mass cannot have a large momentum even if the subject travelling of a high speed.


An inelastic collision is one in which objects stick together after impact, and kinetic energy is not conserved. This lack of conservation means that the forces between colliding objects may convert kinetic energy to other forms of energy, such as potential energy or thermal energy.


m1 v1i+m2 v2i= (m1+m2) vf

m1=mass object 1

v1 i=initial velocity object 1

m2=mass object 2

v2 i=initial velocity object 2

vf=final velocity of objects






-When a collision occurs in an isolated system, the total momentum of the system of objects is conserved. Provided that there are no net external forces acting upon the objects, the momentum of all objects before the collision equals the momentum of all objects after the collision.

Elastic and Inelastic Collisions. A perfectly elastic collision is defined as one in which there is no loss of kinetic energy in the collision. An inelastic collision is one in which part of the kinetic energy is changed to some other form of energy in the collision.


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