AFCT Mechanical Comprehension 2

Question 1

A lever has a fulcrum placed 2 feet from a 100-pound load and 8 feet from the effort. What effort force is needed to lift the load?

Accepted Answer

25 pounds

Answer

50 pounds

Answer

40 pounds

Answer

12.5 pounds

Question 2

Which simple machine is a screw most closely related to?

Accepted Answer

Inclined plane

Answer

Lever

Answer

Pulley

Answer

Wheel and axle

Question 3

If two gears are meshed together, what can be said about their rotation?

Accepted Answer

They rotate in opposite directions

Answer

They rotate in the same direction

Answer

The larger gear always rotates faster

Answer

Their speeds are always equal

Question 4

What happens to water pressure as depth increases?

Accepted Answer

It increases

Answer

It decreases

Answer

It stays the same

Answer

It fluctuates randomly

Question 5

A fixed pulley is primarily used to:

Accepted Answer

Change the direction of force

Answer

Multiply force

Answer

Increase speed

Answer

Reduce friction

Question 6

What principle explains why a hydraulic jack can lift a heavy vehicle with a small force?

Accepted Answer

Pascal's Law

Answer

Newton's Third Law

Answer

Bernoulli's Principle

Answer

Archimedes' Principle

A lever has a fulcrum placed 2 feet from a 100-pound load and 8 feet from the effort.What effort force is needed to lift the load?