Unit Seven: Torque and Rotational Motion- essential knowledge

What are displacement, velocity, and acceleration classified as in physics?

Displacement, velocity, and acceleration are all vector quantities.

How does the choice of reference frame affect displacement, velocity, and acceleration?

A choice of reference frame determines the direction and magnitude of displacement, velocity, and acceleration.

What are the three fundamental forces in nature?

The three fundamental forces are the gravitational force, the electroweak force, and the strong force.

How are forces detected in inertial reference frames?

Forces are detected by their influence on the motion (specifically the velocity) of an object, making force a vector quantity like velocity.

What is a force vector, and what happens when multiple forces act on an object?

A force vector has both magnitude and direction. When multiple forces act on an object, the vector sum of these forces, known as the net force, causes a change in the object's motion.

How is an object's acceleration related to the net force acting on it?

The acceleration of an object is directly proportional to the net force acting on it.

What is the lever arm in the context of rotational motion?

The lever arm is the perpendicular distance from the axis of rotation to the line of application of the force.

How is the magnitude of torque calculated?

The magnitude of torque is the product of the magnitude of the lever arm and the magnitude of the force applied.

How can rotational motion be described?

Rotational motion can be described in terms of angular displacement, angular velocity, and angular acceleration about a fixed axis.

How is rotational motion related to linear motion for a point on a rotating object?

Rotational motion of a point can be related to linear motion using the distance of the point from the axis of rotation.

What is angular momentum, and how is its direction determined?

Angular momentum is a vector quantity, and its direction is determined by the right-hand rule.What is angular momentum, and how is its direction determined?

How do you calculate the magnitude of angular momentum for a point object about an axis?

The magnitude of angular momentum for a point object is calculated by multiplying the perpendicular distance from the axis of rotation to the line of motion by the magnitude of linear momentum.

How is the magnitude of angular momentum for an extended object found?

The magnitude of angular momentum for an extended object is found by multiplying the rotational inertia by the angular velocity.

What factors affect an object's rotational inertia?

Rotational inertia is affected by factors such as the distribution of mass relative to the axis of rotation, which explains why a hoop has more rotational inertia than a puck of the same mass and radius.

How do you determine the angular momentum of a system with respect to an axis of rotation?

The angular momentum of a system is the sum of the angular momenta of the objects within the system, with respect to the axis of rotation.

How is the angular momentum of an object about a fixed axis calculated?

The angular momentum of an object about a fixed axis is found by multiplying the momentum of the object by the perpendicular distance from the axis to the line of motion of the object.