ASVAB Mechanical Comprehension Practice Test 884593 Results

	Your Results	Global Average
Questions	5	5
Correct	0	2.98
Score	0%	60%

Review

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

57% Answer Correctly

	aeronautics
	engineering
	physics
	mechanics

Solution

Mechanics deals with motion and the forces that produce motion.

2 What's the mechanical advantage of a wedge that's 3 inches wide and 18 inches long?

83% Answer Correctly

	12
	6.6
	2
	6

Solution

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

MA = \( \frac{l}{t} \) = \( \frac{18 in.}{3 in.} \) = 6

3 A 340 lb. barrel is rolled up a 7 ft. ramp to a platform that's 4 ft. tall. What effort is required to move the barrel?

53% Answer Correctly

	194.3 lbs.
	291.4 lbs.
	197.3 lbs.
	97.1 lbs.

Solution

This problem describes an inclined plane and, for an inclined plane, the effort force multiplied by the effort distance equals the resistance force multipied by the resistance distance:

F_ed_e = F_rd_r

Plugging in the variables from this problem yields:

F_e x 7 ft. = 340 lbs. x 4 ft.
F_e = \( \frac{1360 ft⋅lb}{7 ft.} \) = 194.3 lbs.

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

66% Answer Correctly

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

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.

Force of friction due to kinetic friction is __________ the force of friction due to static friction.

40% Answer Correctly

	lower than
	opposite
	the same as
	higher than

Solution

The formula for force of friction (F_f) is the same whether kinetic or static friction applies: F_{f =}μF_N. To distinguish between kinetic and static friction, μ_k and μ_s are often used in place of μ.