ASVAB Mechanical Comprehension Practice Test 49154 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.43
Score	0%	69%

Review

1 What's the mechanical advantage of a wedge that's 3 inches wide and 24 inches long?

83% Answer Correctly

	11
	4
	8
	9.5

Solution

The mechanical advantage (MA) of a wedge is its length divided by its thickness:

MA = \( \frac{l}{t} \) = \( \frac{24 in.}{3 in.} \) = 8

A wedge is most similar to what other type of simple machine?

70% Answer Correctly

	first-class lever
	inclined plane
	third-class lever
	second-class lever

Solution

The wedge is a moving inclined plane that is used to lift, hold, or break apart an object. A wedge converts force applied to its blunt end into force perpendicular to its inclined surface. In contrast to a stationary plane where force is applied to the object being moved, with a wedge the object is stationary and the force is being applied to the plane. Examples of a wedge include knives and chisels.

3 If input effort is 700 ft⋅lb, what output effort will be produced by a machine with a mechanical advantage of 2?

79% Answer Correctly

	700ft⋅lb
	2800ft⋅lb
	350ft⋅lb
	1400 ft⋅lb

Solution

Mechanical advantage is the ratio of output force to input force and tells us by how many times a machine multiplies input effort. So, a machine with a mechanical advantage of 2 will multiply an input effort of 700 ft⋅lb by 2 to produce an output effort of 1400 ft⋅lb.

The work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle. This defines which of the following?

60% Answer Correctly

	conservation of mechanical energy
	mechanical advantage
	Pascal's law
	work-energy theorem

Solution

The work-energy theorem states that the work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle. Simply put, work imparts kinetic energy to the matter upon which the work is being done.

The science that deals with motion and the forces that produce motion is called which of the following?

57% Answer Correctly

	mechanics
	engineering
	physics
	aeronautics

Solution

Mechanics deals with motion and the forces that produce motion.