AFCT Mechanical Aptitude 2

Question 1

A wheelbarrow is an example of which class of lever?

Accepted Answer

Second class

Answer

A wheelbarrow is a second-class lever: fulcrum (wheel) at one end, effort (handles) at the other, load between them.

Question 2

If a 20-tooth gear drives a 60-tooth gear, what is the gear ratio?

Accepted Answer

1:3

Answer

Gear ratio = driving gear teeth : driven gear teeth = 20:60 = 1:3.

Question 3

Which statement about friction is correct?

Accepted Answer

Static friction is generally greater than kinetic friction

Answer

Static friction (resistance to starting motion) is typically greater than kinetic friction (resistance during motion).

Question 4

A spring scale reads 10 pounds when a box is hung from it. Pulled horizontally on a table, the scale reads 4 pounds to start sliding. What is the coefficient of static friction?

Accepted Answer

0.4

Answer

Coefficient of static friction = friction force / normal force = 4 / 10 = 0.4.

Question 5

What happens to mechanical advantage as an inclined plane's angle decreases (becomes more gradual)?

Accepted Answer

It increases

Answer

A more gradual inclined plane has greater mechanical advantage: less force needed but longer distance.

(AFCT) Armed Forces Classification Test Practice Test

(AFCT) Armed Forces Classification Test Practice Test

AFCT Mechanical Aptitude 2