20241212
Authored by Chi-Ying Lin
Engineering
University
Used 1+ times
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5 questions
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1.
MULTIPLE SELECT QUESTION
1 min • 1 pt
When using a wedge to lift or separate a heavy object, which of the following statements about the relationship between friction and the wedge is correct?
Friction reduces the efficiency of the wedge because part of the applied force is used to overcome friction.
As the coefficient of friction increases, the force required to move the wedge also increases, especially for wedges with larger angles.
The effectiveness of a wedge is independent of friction and depends only on its geometry (e.g., the wedge angle).
If the coefficient of friction is zero, the force required to move the wedge is minimized and depends only on the wedge's geometry.
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Which of the following is incorrect about dry friction?
Dry friction depends on the contact area between the surfaces.
The coefficient of friction depends on the roughness and material of the surfaces in contact.
The limiting static friction force is always greater than the kinetic friction force.
Dry friction acts opposite to the direction of motion or intended motion.
3.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
According to the sign convention for internal forces in this class, which of the following is correct for shear force and bending moment?
Shear force is positive when it causes clockwise rotation of the segment.
Shear force is negative when it causes clockwise rotation of the segment.
Bending moment is positive when it causes compression on the top fiber of the beam.
Bending moment is positive when it causes tension on the top fiber of the beam.
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
At which point in a beam is the bending moment typically at its maximum value?
Where the shear force is maximum
Where the shear force is zero
Where the load is concentrated
At the supports
5.
MULTIPLE CHOICE QUESTION
15 mins • 10 pts
A construction truck with a mass of m = 8000 kg is parked on a slope with an angle θ = 13.5 to the horizontal. To prevent potential sliding, workers secured the truck with a cable, making an angle α = 60° with the horizontal. Given that the surface is covered with loose soil and gravel with a static friction coefficient = 0.25, and gravitational acceleration g = 9.81 m/s². Tipping is not considered.
(a) Calculate the minimum tension T required in the cable to prevent the truck from sliding. If the tensile capacity of the cable is 50 kN, will the cable break?
(b) If the cable to secure the vehicle becomes loose, will the truck slide down the slope? Ignore the rolling resistance.
The cable will not break and the truck will not slide if unsecured
The cable will not break and the truck will slide if unsecured
The cable will break and the truck will slide if unsecured
The cable will break and the truck will not slide if unsecured
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