WTMA Levers, Pulleys, and Gears 3

Question 1

A fishing rod is an example of which class of lever?

Accepted Answer

Third class

Answer

A fishing rod is a third-class lever — the effort (hand) is between the fulcrum (base hand) and the load (fish).

Question 2

If a movable pulley is used (with one fixed pulley redirecting the rope), how many rope segments support the load?

Accepted Answer

2

Answer

A movable pulley supported by a rope that also passes through a fixed redirecting pulley has 2 rope segments supporting the load.

Question 3

A driver gear with 30 teeth turns a driven gear with 15 teeth. The output gear rotates:

Accepted Answer

At double the speed with less torque

Answer

Fewer teeth on the driven gear means it spins faster but produces less torque than the driver.

Question 4

An effort of 60 lb is applied 5 feet from the fulcrum on a first-class lever. What load can be balanced 3 feet from the fulcrum on the other side?

Accepted Answer

100 lb

Answer

Effort × 5 = Load × 3 → 300 = Load × 3 → Load = 100 lb.

Question 5

Which of the following best describes mechanical advantage?

Accepted Answer

The ratio of output force to input force

Answer

Mechanical advantage is the ratio of the output force (load) to the input force (effort).

WTMA - Wiesen Test of Mechanical Aptitude Practice Test