ASVAB Mechanical Comprehension Practice Test 529849 Results

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

Review

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

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

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.

2 What's the mechanical advantage of a wedge that's 2 inches wide and 18 inches long?

83% Answer Correctly

	13.5
	9
	27
	3

Solution

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

MA = \( \frac{l}{t} \) = \( \frac{18 in.}{2 in.} \) = 9

Concurrent forces:

55% Answer Correctly

	act along the same line of action
	act in a common plane
	act in a common dimension
	pass through a common point

Solution

Collinear forces act along the same line of action, concurrent forces pass through a common point and coplanar forces act in a common plane.

The mechanical advantage of a block and tackle is equal to which of the following?

69% Answer Correctly

	the number of loads
	the number of input forces
	the number of pulleys
	the number of connecting ropes

Solution

Two or more pulleys used together constitute a block and tackle which, unlike a fixed pulley, does impart mechanical advantage as a function of the number of pulleys that make up the arrangement. So, for example, a block and tackle with three pulleys would have a mechanical advantage of three.

A block and tackle with four pulleys would have a mechanical advantage of:

79% Answer Correctly

	0
	2
	4
	1