AFCT Mechanical Aptitude 3

Question 1

Two objects of equal weight are placed on a balance beam, each 3 feet from the fulcrum on opposite sides. What happens?

Accepted Answer

The beam stays balanced

Answer

Equal weights at equal distances create equal torques on both sides, keeping the beam balanced.

Question 2

What principle explains why a boat floats?

Accepted Answer

Archimedes' Principle

Answer

Archimedes' Principle states that an object in fluid experiences an upward force equal to the weight of fluid displaced.

Question 3

A pendulum is pulled to one side and released. At which point does it have the greatest kinetic energy?

Accepted Answer

At the lowest point (bottom of swing)

Answer

At the bottom of the swing, all potential energy has converted to kinetic energy and the pendulum moves at maximum speed.

Question 4

Water flows from a large pipe into a smaller pipe. What happens to the water's speed?

Accepted Answer

Speed increases

Answer

The continuity equation requires the same volume to pass through a smaller area, so speed must increase.

Question 5

What is the primary advantage of a compound pulley system over a single pulley?

Accepted Answer

It multiplies the applied force

Answer

A compound pulley system uses multiple pulleys to multiply the applied force, requiring less effort to lift heavy loads.

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