ASVAB Mechanical Comprehension Practice Test 9330 Results

	Your Results	Global Average
Questions	5	5
Correct	0	2.83
Score	0%	57%

Review

The principle of conservation of mechanical energy states that, as long as no other forces are applied, what will remain constant as an object falls?

45% Answer Correctly

	kinetic energy
	potential energy
	total mechanical energy
	acceleration

Solution

As an object falls, its potential energy is converted into kinetic energy. The principle of conservation of mechanical energy states that, as long as no other forces are applied, total mechanical energy (PE + KE) of the object will remain constant at all points in its descent.

2 How much work can a 2 hp engine do in 4 seconds?

52% Answer Correctly

	1 ft⋅lb
	4400 ft⋅lb
	0 ft⋅lb
	2 ft⋅lb

Solution

Horsepower (hp) is a common measure of power output for complex machines. By definition, a 1 hp machine does 550 ft⋅lb of work in 1 second: 1 hp = 550 ft⋅lb/s. Substituting the variables for this problem gives us:
\( W = 2 hp \times 550 \frac{ft⋅lb}{s} \times 4s = 4400 ft⋅lb \)

The principle of moments defines equilibrium in terms of:

53% Answer Correctly

	power
	torque
	speed
	energy

Solution

According to the principle of moments, you can maintain equilibrium if the moments (forces) tending to clockwise rotation are equal to the moments tending to counterclockwise rotation. Another name for these moments of force is torque.

Friction between two or more solid objects that are not moving relative to each other is called:

74% Answer Correctly

	gravitational friction
	static friction
	dynamic friction
	kinetic friction

Solution

Static friction is friction between two or more solid objects that are not moving relative to each other. An example is the friction that prevents a box on a sloped surface from sliding farther down the surface.

A wedge converts force applied to its blunt end into force __________ its inclined surface.

57% Answer Correctly

	opposite to
	along
	perpendicular to
	parallel to

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.