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Sample exercises

University · Statics

Horizontal forces are +10 N and −4 N. Find the additional horizontal force needed for equilibrium.

Answer and explanation

-6 N

Their sum is +6 N, so add −6 N.

University · Statics

A perpendicular force of 5 N acts at lever arm 2 m. Find moment magnitude.

Answer and explanation

10 N m

Moment magnitude=force×perpendicular distance.

University · Statics

Can zero net force coexist with nonzero net moment?

  1. Only in a vacuum
  2. Yes
  3. Only with zero mass
  4. No, never
Answer and explanation

Yes

A force couple can have zero resultant force and nonzero moment.

University · Statics

Why should a free-body diagram identify the isolated body clearly?

Answer and explanation

It determines which interactions are external and which are internal, preventing double-counting or omitted reactions.

Credit system boundary.

University · Statics

A symmetric simply supported beam carries a central 20 N load with negligible self-weight. Find either upward support reaction.

Answer and explanation

10 N

Symmetry and vertical force balance split the load equally.

University · Statics

Does a correct classroom static calculation certify a real building design?

  1. Only if the answer is an integer
  2. Yes, universally
  3. No
  4. Only if printed
Answer and explanation

No

Real design needs additional load, material, code and professional checks.

Study notes