(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The following statements are true/false

1) The net torque on an object is equal to its moment of inertia times angular acceleration.

2) Angular momentum will be conserved if there are no external torques acting on it.

3) When its linear momentum is zero, the angular momentum of a solid object is also zero.

4) Any force acting on an object can change the objects angular momentum.

5) Torque is equal to the perpendicular force applied through any lever arm.

2. Relevant equations

Sum of torques = I*alpha

L = I*omega

L = r*p*sin(theta)

T = F*r*sin(theta)

3. The attempt at a solution

1) True: Positive on this one, seen in equation T = I*alpha

2) True: Angular momentum is a conserved quantity and cannot be changed from within system

3) True?: Not sure on this one, I figured since they are analogous properties and L = r*p*sin(theta) it would be true.

4) False: Only external forces and torques can change angular momentum

5) False: It is not always the perpendicular force at the lever arm as seen by the equation T = F*r*sin(theta), where theta is not necessarily 90 degrees.

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: A few Conceptual Questions Regarding Torque & Angular Momentum

**Physics Forums | Science Articles, Homework Help, Discussion**