Does the angle of fall affect the change in kinetic energy of a log?

In summary, the conversation discusses two cases in which a log is lifted and allowed to fall freely. In one case, the log falls inline with its initial position, while in the other case, it falls at an angle. Even though the cases are similar, there is a difference in the distance between the center of masses of the log in its initial and final positions. The reason for this difference is that there is no difference in kinetic energy between the two cases, as the log ends up with zero KE in both cases. This is because no energy is needed to move something from one stationary position to another.
  • #1
Manula
28
0
There is a uniform log lying on the ground.Now we can lift this up from one end such that the other end is in contact with the ground.Now keep the log vertical.

Case 1: Let the log fall freely such that when it comes to rest it is inline with the initial position of the log.

Case 2: Let the log fall freely such that it makes angle(say 60°) with the initial position when it comes to rest.

My question is, in the two cases the distance between the center of masses of the log in its initial position and final is different, Even though the cases are similar.
What causes this difference?
 
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  • #2
Hi Manula! :smile:
Manula said:
… in the two cases the distance between the center of masses of the log in its initial position and final is different, Even though the cases are similar.
What causes this difference?

There's no difference in kinetic energy

they both end up with zero KE (and they both had mgh KE just before they hit the ground) …

we don't need any energy to move something from one stationary position to another! :wink:
 
  • #3
tiny-tim, Thank you! :)
 

1. What is Kinetic Energy?

Kinetic Energy is the energy an object has 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.

2. How is Kinetic Energy Calculated?

Kinetic Energy is calculated using the equation KE = 1/2 * m * v^2, where m is the mass of the object and v is its velocity.

3. What Causes a Change in Kinetic Energy?

A change in Kinetic Energy is caused by a change in either the mass or velocity of an object. An increase in either of these factors will result in an increase in Kinetic Energy, while a decrease will result in a decrease in Kinetic Energy.

4. What is the Relationship Between Kinetic Energy and Potential Energy?

Kinetic Energy and Potential Energy are two forms of mechanical energy. Kinetic Energy is the energy an object has due to its motion, while Potential Energy is the energy an object has due to its position or configuration. The two energies are interrelated and can be converted into each other.

5. How is Change in Kinetic Energy Related to Work and Force?

The change in Kinetic Energy of an object is equal to the work done on the object by a force. This is described by the work-energy theorem, which states that the net work done on an object is equal to the change in its Kinetic Energy. Therefore, the greater the force applied to an object, the greater the change in Kinetic Energy.

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