Work, Power, Force, and Motion

What is the primary function of a worm gear in aviation?

To provide extreme mechanical advantage with slow rotation.

A gear system has a drive gear with 25 teeth and a driven gear with 75 teeth. What is the gear ratio?

3:1

What type of simple machine is used in aircraft control cable systems to change force direction?

pulley

According to Newton's Third Law, how does an aircraft generate lift?

Air is pushed downward off the wing, creating an equal upward reaction force.

Which unit of power is commonly used to measure aircraft engine performance?

Horsepower

If you apply force to an object and it does not move, how much work is done?

Zero, because work requires movement.

What is the mechanical advantage of a system where an input force of 50 lb. moves a 200 lb. object?

4

What is the mechanical advantage of an inclined plane that is 12 ft. long and 3 ft. high?

4

Which of the following is an example of a third-class lever in aviation

landing gear retraction system

Which simple machine principle is used in screw jacks for aircraft maintenance?

incline plane

What type of stress occurs on an aircraft wing experiencing aerodynamic lift?

bending

What is the work done when lifting a 500 lb. aircraft engine 8 feet off the ground?

4000 ft-lb

Why do aircraft use planetary gears in their engine reduction gearboxes?

To decrease propeller shaft speed while maintaining high engine RPM.

Which type of stress occurs when aircraft cables are pulled in opposite directions?

tension

If an aircraft maintenance technician lifts a 600 lb. component 6 feet in 12 seconds, what is the power output in ft-lb/sec?

300 ft-lb/sec

A first-class lever has the fulcrum positioned:

Between the effort and the resistance.

Newton's First Law of Motion states that an object in motion:

Remains in motion unless acted upon by an external force.

Which of the following best explains Newton's Second Law in aviation?

The force required to accelerate an aircraft depends on its mass and the acceleration needed.

How does force multiplication benefit aircraft hydraulic systems?

It allows small input forces to produce larger output forces.

Power is defined as:

Option A

The rate at which work is done.