What fraction of the kinetic energy is converted to other forms in collision?

In summary, the conversation discusses a problem involving two blocks of different masses colliding on a frictionless track. The first block has an initial velocity and collides with the stationary second block, with the final masses being in a 9:1 ratio. The question is asked about the fraction of initial kinetic energy that is converted to other forms (heat, sound, etc.) as a result of the collision. The solution is found by calculating the velocity after the collision and comparing the total kinetic energies before and after, resulting in 90% of the initial kinetic energy being converted to other forms.
  • #1
dawn_pingpong
50
0

Homework Statement


there are 2 blocks along a frictionless track. block 1 has a mass of m1 and block 2 has a mass of m2. Block 1 is initially moving at a speed of v0. it collides and sticks to the initial stationary block 2. (m2=9m1) what fraction of the inital kinetic energ of the system is converted to other forms (heat, sound...) as a result of the collision?

1)1%
2)10%
3)50%
4)90%
5)95%


Homework Equations


I sort of think this as more of a general knowledge question... this is the 2nd part. the first part ask you to calculate the velocity after collision


The Attempt at a Solution

 
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  • #2
The figure out part 2, you need to solve part 1.
 
  • #3
the answer to part 1 is 1/10v0, if I'm not wrong. Used momentum formula.
 
  • #4
dawn_pingpong said:
the answer to part 1 is 1/10v0, if I'm not wrong. Used momentum formula.

Correct. Now you just need to compute the total kinetic energies before and after the collision, and compare them.
 
  • #5
yay yay thank you!

initial:final=1 x v^2 : 10 x (0.1v)^2=1:0.1
so 90% of KE was converted to other forms! Thank you once again:D
 

FAQ: What fraction of the kinetic energy is converted to other forms in collision?

What is the definition of kinetic energy?

Kinetic energy is the energy possessed by an object due to its motion.

How is kinetic energy measured?

Kinetic energy is measured in joules (J) and can be calculated using the formula: KE = 1/2 * mass * velocity^2.

What does it mean for kinetic energy to be converted to other forms in a collision?

In a collision, some of the kinetic energy of the moving object is transferred to other forms of energy, such as sound, heat, or potential energy.

What factors affect the fraction of kinetic energy that is converted to other forms in a collision?

The mass and velocity of the objects involved, as well as the type of collision (elastic or inelastic), can affect the fraction of kinetic energy that is converted to other forms.

How can we calculate the fraction of kinetic energy that is converted to other forms in a collision?

The fraction of kinetic energy that is converted to other forms can be calculated by dividing the total energy lost in the collision by the initial kinetic energy of the objects.

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