NCEES Statics 3

Question 1

A 600 N box rests on a surface with a coefficient of static friction μs = 0.35. What is the maximum friction force before sliding begins?

Accepted Answer

210 N

Answer

F_max = μs × N = 0.35 × 600 = 210 N.

Question 2

At an unloaded joint where only two non-collinear members meet, those members carry:

Accepted Answer

Zero force

Answer

By equilibrium at an unloaded joint with two non-collinear members, both must be zero-force members.

Question 3

The centroid of a triangle is located at what fraction of the height measured from the base?

Accepted Answer

1/3

Answer

The centroid of a triangle is located at h/3 from the base, or one-third of the total height.

Question 4

A force F = 50 N acts at an angle of 30° above the horizontal. What is the horizontal component Fx?

Accepted Answer

43.3 N

Answer

Fx = F cos(30°) = 50 × 0.866 = 43.3 N.

Question 5

Varignon's theorem states that the moment of a resultant force about a point equals:

Accepted Answer

The sum of the moments of its components about that point

Answer

Varignon's theorem states M_R = ΣM_components, allowing force components to replace the resultant.

NCEES Practice Test