Units of force in engineering systems — identify the correct interpretation of engineer’s force units among the choices provided.

Introduction / Context:
Engineering problems use several unit systems. In mechanics, the SI unit of force is the newton (an absolute unit based on fundamental dimensions), while the CGS unit is the dyne (also absolute). Many curricula and exam questions group these as “engineer’s units” to emphasize familiarity with both, even though gravitational units (kgf, lbf) are also used in practice.

Given Data / Assumptions:

• Newton (N) is the SI absolute unit (1 N = 1 kgm/s^2).
• Dyne is the CGS absolute unit (1 dyne = 1 gcm/s^2).
• The options list absolute units familiar to engineers.

Concept / Approach:

Since both the newton and the dyne are absolute force units that engineers must convert between (1 N = 10^5 dynes), and each individual statement naming these as absolute units is correct, the most inclusive choice “All the above” is appropriate for this set-based question format.

Step-by-Step Solution:

Verification / Alternative check (if short method exists):

Dimensional analysis: both units reduce to mass*length/time^2; conversion 1 N = 10^3 g * 10^2 cm/s^2 = 10^5 dynes supports consistency.

Why Other Options Are Wrong:

Choosing only one unit omits the other recognized absolute unit. “Kilogram-force only” is a gravitational unit and not an absolute unit; it is outside the scope of the listed correct statements.

Common Pitfalls (misconceptions, mistakes):

Confusing absolute units with gravitational units; forgetting the CGS–SI conversion factor of 10^5 between dyne and newton.

Final Answer:

All the above.