ASVAB Mechanical Comprehension Practice Test 916927 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.11
Score	0%	62%

Review

Which of the following statements about drag is false?

58% Answer Correctly

	the amount of drag depends on the speed of an object
	the amount of drag depends on the shape of an object
	drag occurs during movement through a fluid
	slower objects experience more drag than faster objects

Solution

Drag is friction that opposes movement through a fluid like liquid or air. The amount of drag depends on the shape and speed of the object with slower objects experiencing less drag than faster objects and more aerodynamic objects experiencing less drag than those with a large leading surface area.

Normal force is generally equal to the __________ of an object.

62% Answer Correctly

	weight
	mass
	coefficient of friction
	density

Solution

Normal force arises on a flat horizontal surface in response to an object's weight pressing it down. Consequently, normal force is generally equal to the object's weight.

The mass of an object correlates to the size of the object but ultimately depends on:

67% Answer Correctly

	the object's density
	gravity
	the object's weight
	the object's potential energy

Solution

Mass is a measure of the amount of matter in an object. In general, larger objects have larger mass than smaller objects but mass ultimately depends on how compact (dense) a substance is.

Which of the following is not a type of structural load?

49% Answer Correctly

	wind load
	dead load
	occupancy load
	live load

Solution

Dead load is the weight of the building and materials, live load is additional weight due to occupancy or use, snow load is the weight of accumulated snow on a structure and wind load is the force of wind pressures against structure surfaces.

5 If the green arrow in this diagram represents 440 ft⋅lb of work, how far will the box move if it weighs 110 pounds?

73% Answer Correctly

	8 ft.
	440 ft.
	4 ft.
	220 ft.

Solution

The Law of Work states that the work put into a machine is equal to the work received from the machine under ideal conditions. In equation form, that's:

W_in = W_out
F_effort x d_effort = F_resistance x d_resistance

In this problem, the effort work is 440 ft⋅lb and the resistance force is 110 lbs. and we need to calculate the resistance distance:

W_in = F_resistance x d_resistance
440 ft⋅lb = 110 lbs. x d_resistance
d_resistance = \( \frac{440ft⋅lb}{110 lbs.} \) = 4 ft.