Uniform Circular Motion Model: Torque & Force

Section 7.3

In uniform circular motion, the linear speed is constant.

True

In uniform circular motion, the velocity is constant.

False

What causes the centripetal acceleration?

A net force directed toward the center of the circle

What is Newton’s Law of Universal Gravitation?

Describes the interaction between two objects having mass.

What would be the primary circular object?

The more massive body

Its motion is negligible compared to the secondary’s motion

Location at the center of orbit

What would be the secondary circular object?

The less massive body

Moves in a circular path about the primary

If the distance between two masses is doubled, what happens to the force?

The force decreases by a factor of 4

If one mass is doubled, and the other mass is halved, what happens to the force?

The force remains unchanged

How is the weight of an objected defined?

The magnitude of the net gravitational force exerted on an object by all other objects in the universe.

The weight of an object near the surface of Earth is almost entirely due to the object-Earth interactions

What is Torque?

That influence on a system by its surroundings that causes it to experience angular acceleration

What is the symbol and SI unit for Torque?

𝜏
Newton-meter

What is Newton’s First Law of Rotational Motion?

An object rotating will remain in rotation with constant angular velocity in the absence of a net torque

What is rotational inertia?

The tendency of matter to resist changes to its rotation, rotating at constant angular velocity