Linear and Angular momentum

In summary, linear momentum is a measure of an object's motion in a straight line, while angular momentum is a measure of an object's rotational motion around an axis. Linear momentum is calculated by multiplying an object's mass by its velocity in the direction of motion, and can be affected by an object's mass, velocity, and external forces. Angular momentum is conserved when the net external torque acting on a system is zero, and an object can have both linear and angular momentum at the same time.
  • #1
foxjwill
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Homework Statement


Problem is attached.


Homework Equations





The Attempt at a Solution


I just can't remember how to translate linear momentum to angular momentum. I'm not sure how to apply conservation of momentum.
 

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  • #2
i've not yet seen the attached file, it's not yet approved.

linear momentum = mv
now v = rw
w is angular velocity.

angular momentum = mrw

was that what you were asking?
 
  • #3


Linear momentum is a measure of an object's motion in a straight line, while angular momentum is a measure of an object's rotational motion. To translate between the two, you can use the equation L = Iω, where L is angular momentum, I is moment of inertia, and ω is angular velocity. This equation shows that an object's angular momentum is directly proportional to its moment of inertia and angular velocity.

To apply conservation of momentum, you must first identify all of the objects involved in the system and their initial and final velocities. Then, you can use the equation ∑p = m∑v, where ∑p is the total momentum of the system, m is the mass of each object, and ∑v is the total velocity of all objects. This equation states that the total momentum before an event must be equal to the total momentum after the event, as long as there are no external forces acting on the system. This principle can be applied to both linear and angular momentum, as long as the system is isolated and there are no external torques acting on it.
 

1. What is the difference between linear and angular momentum?

Linear momentum is a measure of an object's motion in a straight line, while angular momentum is a measure of an object's rotational motion around an axis.

2. How is linear momentum calculated?

Linear momentum is calculated by multiplying an object's mass by its velocity in the direction of motion. The formula is p = mv, where p is momentum, m is mass, and v is velocity.

3. What affects an object's linear momentum?

An object's linear momentum can be affected by its mass, velocity, and external forces acting upon it. The greater the mass or velocity of an object, the greater its linear momentum will be. External forces, such as friction or gravity, can also change an object's momentum.

4. How is angular momentum conserved?

Angular momentum is conserved when the net external torque acting on a system is zero. This means that the total amount of angular momentum in a system will remain constant unless acted upon by an external force.

5. Can an object have both linear and angular momentum?

Yes, an object can have both linear and angular momentum at the same time. For example, a spinning top has both rotational motion (angular momentum) and linear motion (linear momentum).

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