How is the direction of tangential acceleration determined for a rotating link_________________?
Show answer Hide answer
Answer: C. could be either same or opposite to velocity
Explanation
The direction of tangential acceleration for a rotating link can be either same or opposite. It depends entirely on whether the link is undergoing rotational acceleration or deceleration. Accelerating links have tangential vectors aligned with velocity, while decelerating links oppose it. Tangential acceleration is perpendicular to radial centripetal acceleration on a rotating body. The vector points along the tangent of the circular path described by the rotating point. Angular acceleration multiplied by link radius determines the magnitude of tangential acceleration.
Dynamic analysis of mechanical linkages requires calculating both tangential and normal acceleration vectors. Crankshaft design in internal combustion engines involves complex tangential acceleration profiling. Engineers prevent structural failure by accounting for peak acceleration forces in moving parts. Option A assumes tangential acceleration always aligns with velocity, ignoring deceleration phases. Option B assumes it always opposes velocity, ignoring speed-up phases in rotating machinery. Option D incorrectly confuses tangential acceleration orientation with centripetal acceleration geometry.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. What kinematic parameters can be determined using Klein’s construction__________________?
Show answer Hide answer
Answer: B. acceleration of various parts
Klein's construction is specifically designed to determine linear and angular accelerations graphically. By drawing specific geometric quadrilaterals, acceleration vectors for the piston and rod are found. The primary pu...
Q2. What are open pairs defined as in the study of mechanism joints__________________?
Show answer Hide answer
Answer: C. elements of pairs not held together mechanically
Kinematic pairs that rely solely on physical contact without mechanical fastening are classified as open pairs. Gravity or external external forces typically keep the contacting elements together during their operating c...
Q3. How is the pitch point on a cam profile defined_________________?
Show answer Hide answer
Answer: B. the point on cam pitch curve having the maximum pressure angle
The pitch point on a cam profile corresponds specifically to the location on the pitch curve having maximum pressure angle. This critical point helps engineers evaluate force transmission efficiency and potential followe...
Q4. An approximate straight-line mechanism is classified as what type of linkage____________________?
Show answer Hide answer
Answer: A. four bar linkage
An approximate straight-line mechanism uses four linked bars to generate nearly linear motion. Peaucellier and Watt mechanisms are classic examples built on four-bar linkage configurations. Four-bar linkages provide the...
Q5. What characteristic defines the two elements forming a kinematic pair______________?
Show answer Hide answer
Answer: C. permit relative motion
The fundamental definition of a kinematic pair requires that its two constituent elements have constrained relative motion. Without relative motion between the connected parts, the assembly cannot function as a working m...
Q6. A rotating shaft supported inside a bearing represents what classification of kinematic pair________________?
Show answer Hide answer
Answer: A. lower pair
A rotating shaft supported inside a journal bearing features surface contact between the mating cylindrical elements. This extensive surface contact area classifies the shaft and bearing assembly as a lower kinematic pai...