How to Calculate Angular Impulse for Inelastic Collision?

In summary, the problem involves a 5.1 inelastic collision where two objects stick together. The equation used to solve for the impulse is Impulse = Lf - Li, which can also be written as Iwf - Iwi. For angular impulse, the equation used is (1/2MR^2 + mR^2)w1 - (1/2MR^2)w0 + mRv0, which takes into account the moment of inertia and angular velocity of both objects. It is important to calculate the impulse separately for each object and then add them together to get the total impulse.
  • #1
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Homework Statement



(Refer to attachment)

Homework Equations



None.

The Attempt at a Solution



5.1 Inelastic collision because they stick together.

5.2 Impulse = Lf - Li
= Iwf - Iwi
= (1/2MR^2 + mR^2)w1 - (1/2MR^2)w0 + mRv0

I tried to use this equation which is related to the linear one, but not sure if it is right for angular impulse. Also I don't understand whether you can have an impulse for 2 objects at the same time (as for example the linear equation F(t) = m(vf - vi), only has the mass of 1 of the objects, not both of them).
 

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  • #2
I think the impulse should be calculated for each object separately, and then add them up.Impulse for M = Iwf - Iwi = (1/2MR^2)w1 - (1/2MR^2)w0Impulse for m = Iwf - Iwi = mR^2w1 - mRv0Total Impulse = (1/2MR^2)w1 - (1/2MR^2)w0 + mR^2w1 - mRv0 = (1/2MR^2 + mR^2)w1 - (1/2MR^2)w0 + mRv0
 

1. What is the definition of angular impulse?

Angular impulse is a measure of the change in angular momentum of a system. It is calculated by multiplying the average force applied to an object by the time during which the force is applied.

2. How is angular impulse related to angular momentum?

Angular impulse and angular momentum are directly proportional to each other. This means that a larger impulse will result in a larger change in angular momentum.

3. What is the difference between angular and linear impulse?

Angular impulse refers to the change in angular momentum of an object, while linear impulse refers to the change in linear momentum. Angular momentum is a measure of rotational motion, while linear momentum is a measure of linear motion.

4. How can angular impulse be applied in real-life situations?

Angular impulse is commonly used in sports, such as when a pitcher throws a ball or a gymnast performs a routine. It is also used in engineering and physics to analyze the motion of rotating objects.

5. What are the units of angular impulse?

The units of angular impulse are kilogram-meter squared per second (kg·m2/s) in the SI system, or pound-foot per second (lb·ft/s) in the English system.

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