WTMA Force, Motion, and Friction 5

Question 1

A 200 N force is applied at an angle of 60° above horizontal to push a box across the floor. What is the horizontal component of this force?

Accepted Answer

100 N

Answer

The horizontal component is F × cos(60°) = 200 × 0.5 = 100 N.

Question 2

Which situation has the LEAST friction?

Accepted Answer

A steel ball bearing rolling in a steel race

Answer

Ball bearings are specifically designed to minimize friction through rolling contact and smooth, hardened steel surfaces.

Question 3

A machine part moves in a circle at constant speed. Which statement is true?

Accepted Answer

Its speed is constant but its velocity is changing

Answer

Circular motion at constant speed still involves changing velocity because velocity is a vector and the direction continuously changes.

Question 4

A pulley system is used to lift a 300 N load with only 150 N of effort. What is the mechanical advantage?

Accepted Answer

2

Answer

Mechanical advantage equals load force divided by effort force: 300 N ÷ 150 N = 2.

Question 5

A gear with 40 teeth meshes with a gear with 10 teeth. If the small gear turns at 200 RPM, how fast does the large gear turn?

Accepted Answer

50 RPM

Answer

Gear ratio = 40/10 = 4, so the large gear turns at 200 ÷ 4 = 50 RPM.

WTMA - Wiesen Test of Mechanical Aptitude Practice Test