A Meter Stick on a Horizontal Frictionless Table Top Is

question 15

Multiple Choice

A meter stick on a horizontal frictionless table top is pivoted at the 80-cm mark. A force is applied perpendicularly to the end of the stick at 0 cm, as shown. A second force (not shown) is applied perpendicularly at the 100-cm end of the stick. The forces are horizontal. If the stick does not move, the force exerted by the pivot on the stick:

• A) must be zero
• B) must be in the same direction as and have magnitude
• C) must be directed opposite to and have magnitude
• D) must be in the same direction as and have magnitude
• E) must be directed opposite to and have magnitude

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Definitions:

Eccentric Runout

Variation in the rotational path of a rotating part, causing uneven movement or vibration.

Backlash

The play or loose movement in mechanical components, particularly in gears, resulting from gaps between parts.

Gear Teeth

The individual protrusions on the circumference of a gear that engage with those on another gear to transmit torque and motion.

Runout

A defect that causes side-to-side or lateral movement in a spinning object. In wheels it is commonly caused by imperfections in the wheel’s shape; in disc brakes it can be caused by a distorted rotor, hub flange distortion, or worn wheel bearings.