Angular Momentum

Mr. Andersen explains angular momentum, a vector quantity related to rotating objects. He covers the calculation of angular momentum for both point and extended objects, using formulas involving radius, mass, velocity, and rotational inertia. The video also discusses the role of torque in changing angular momentum and demonstrates practical applications using a turntable and photogate. Key concepts include the right-hand rule for direction and the conservation of angular momentum in collisions.

What is the primary difference between linear momentum and angular momentum?

• Angular momentum is a scalar, while linear momentum is a vector.

• Linear momentum is a vector, while angular momentum is not.

• Angular momentum involves rotation, while linear momentum does not.

• Linear momentum involves rotation, while angular momentum does not.

How do you calculate the angular momentum of a point object?

• Multiply the torque by the time.

• Multiply the velocity by the rotational inertia.

• Multiply the radius by the linear momentum.

• Multiply the mass by the radius.

Which rule helps determine the direction of angular momentum?

• Left-hand rule

• Momentum rule

• Newton's rule

• Right-hand rule

What happens to angular momentum when two objects collide on a turntable?

• It is destroyed.

• It is halved.

• It is doubled.

• It is conserved.

How can you measure angular velocity in a physics lab?

• Using a photogate attached to a turntable.

• Using a voltmeter.

• Using a barometer.

• Using a thermometer.

What effect does applying a torque have on an object's angular momentum?

• It changes the direction of angular momentum.

• It decreases the angular momentum.

• It increases the angular momentum.

• It has no effect on angular momentum.

What is the result of reversing the torque on an object with existing angular momentum?

• The object continues in the same direction.

• The object comes to a standstill.

• The object speeds up in the same direction.

• The object explodes.