How an object in translatory motion comes to rotary motion

In summary, in a car race, two motor vehicles collided and became connected, resulting in a rotary motion. This was possible due to the conservation of angular momentum and the fact that the cars had a non-zero angular momentum before the collision. The throttle being on in the green bike also contributed to the rotary motion. Additionally, in collisions on Earth, the effect of friction on the ground must be taken into account in order for angular and linear momentum to be conserved.
  • #1
srivi
15
0
In a car race two motar vehicles are moving with very high speed , they have collided got coneected each other and started rotating together .
Becuase they are in motion according to Newtons first law they are continued with motion,
but how did they got rotary motion ?
 
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  • #2
You mean this accident?

https://www.youtube.com/watch?v=70LYG8jYd98

Don't forget friction and think - where does the smoke around wheels comes from?.
 
  • #3
hi srivi! :smile:

as you know, in every collision, https://www.physicsforums.com/library.php?do=view_item&itemid=53" is conserved

also, https://www.physicsforums.com/library.php?do=view_item&itemid=313" is conserved …

if the two cars do not collide exactly head on, then before the collision they have a non-zero angular momentum about their combined centre of mass …

so they still have that angular momentum after, when they're connected :wink:​

(and if they don't stay connected, then each car will rotate unless the line of the https://www.physicsforums.com/library.php?do=view_item&itemid=340" of the collision is through its own centre of mass)
 
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  • #4
If one of the cars, off to one side of the other, is moving faster, then the system, that is, the two cars together, already has a rotary motion about their center of mass.

In Borek's clip, at least one of the motorcycles, probably both, still has its throttle on.
 
  • #5
HallsofIvy said:
In Borek's clip, at least one of the motorcycles, probably both, still has its throttle on.
The green bike is the one with it's rear tire touching the pavement and spinning the bikes.

For collisions in space, angular momentum is preserved. For collisions on the ground, the Earth is part of the system, and angular and linear momentum are conserved only if you take into account the effect on the earth, due to friction between the tires and the pavement causing some tiny effec on the earth. If the collision occurred on ice, or very slick pavement, then friction would take much longer to slow down the movements after a collision.
 

1. How does an object in translatory motion come to rotary motion?

An object in translatory motion can come to rotary motion through the application of an external force or torque. This force or torque causes a change in the object's velocity, resulting in a rotation around a fixed axis.

2. What factors affect the transition from translatory to rotary motion?

The main factors that affect the transition from translatory to rotary motion include the magnitude and direction of the applied force or torque, the mass and shape of the object, and any external forces or friction acting on the object.

3. How is angular velocity related to translatory velocity?

Angular velocity is the rate of change of an object's angular position around a fixed axis, while translatory velocity is the rate of change of an object's linear position. The two are related through the object's distance from the axis of rotation and the radius of the rotation.

4. Can an object be in both translatory and rotary motion at the same time?

Yes, it is possible for an object to have both translatory and rotary motion at the same time. This can occur when an object is moving along a linear path while also rotating around a fixed axis, such as a spinning top or a rolling ball.

5. How does the conservation of angular momentum apply to translatory and rotary motion?

The conservation of angular momentum states that the total angular momentum of a system remains constant unless acted upon by an external torque. This applies to both translatory and rotary motion, as a change in one can result in a corresponding change in the other to maintain the total angular momentum of the system.

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