Open Note Flashcard November 22

Front

What is tangential velocity?

Back

Tangential velocity is the linear speed of an object moving along a circular path, measured at a point tangent to the circle. It depends on the radius of the circle and the angular speed.

Front

Which has a greater tangential velocity: a kid near the center of a merry-go-round or a kid near the outside?

Back

A kid near the outside of the merry-go-round has a greater tangential velocity because they are moving a larger distance in the same amount of time compared to the kid near the center.

Front

What is the best position to apply force to open a heavy door?

Back

The best position to apply force to open a heavy door is at the edge of the door far from the hinges, as this maximizes the torque applied to the door.

Front

What happens to a person's moment of inertia when they extend their arms while sitting on a spinning stool?

Back

When a person extends their arms, their moment of inertia increases because the mass is distributed further from the axis of rotation.

Front

What is the relationship between moment of inertia and angular speed?

Back

The relationship is described by the conservation of angular momentum: if the moment of inertia increases, the angular speed decreases, and vice versa, assuming no external torques act on the system.

Front

Define angular momentum.

Back

Angular momentum is the quantity of rotation of an object, calculated as the product of its moment of inertia and its angular velocity.

Front

What is torque?

Back

Torque is a measure of the rotational force applied to an object, calculated as the product of the force and the distance from the pivot point (lever arm).

Front

How does applying force at different points on a door affect its opening?

Back

Applying force at points further from the hinges increases the torque, making it easier to open the door.

Front

What is the effect of friction on a spinning stool?

Back

Friction would create resistance, affecting the angular speed and potentially causing the stool to slow down or stop.

Front

Explain the concept of conservation of angular momentum.

Back

The conservation of angular momentum states that if no external torque acts on a system, the total angular momentum of that system remains constant.