ASVAB Mechanical Comprehension Practice Test 300863 Results

Your Results Global Average
Questions 5 5
Correct 0 3.37
Score 0% 67%

Review

1

When it comes to force, mass and acceleration have what kind of relationship?

66% Answer Correctly

inverse

exponential

logarithmic

linear
Solution

Newton's Second Law of Motion states that "The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object." This Law describes the linear relationship between mass and acceleration when it comes to force and leads to the formula F = ma or force equals mass multiplied by rate of acceleration.

2 What's the mechanical advantage of a wedge that's 5 inches wide and 25 inches long?
83% Answer Correctly
4.5
5.5
5
10
Solution

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

MA = \( \frac{l}{t} \) = \( \frac{25 in.}{5 in.} \) = 5

3

For a hydraulic system, pressure applied to the input of the system will increase the pressure in which parts of the system?

58% Answer Correctly

the portions of the system at an altitude below the input

all of these are correct

the portions of the system at an altitude above the input

everywhere in the system
Solution

Pascal's law states that a pressure change occurring anywhere in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere. For a hydraulic system, this means that a pressure applied to the input of the system will increase the pressure everywhere in the system.

4 If the handles of a wheelbarrow are 0.5 ft. from the wheel axle and the load is concentrated at a point 1.5 ft. from the axle, how many pounds of load will a 170 lbs. force lift?
47% Answer Correctly
56.7
226.7
83.9
60
Solution
This problem describes a second-class lever and, for a second class lever, the effort force multiplied by the effort distance equals the resistance force multipied by the resistance distance: Fede = Frdr. In this problem we're looking for resistance force:
\( F_r = \frac{F_e d_e}{d_r} \)
\( F_r = \frac{170 \times 0.5}{1.5} \)
\( F_r = \frac{85.0}{1.5} \)
\( F_r = 56.7 \)
5

Friction resists movement in a direction __________ to the movement.

81% Answer Correctly

opposite

normal

perpendicular

parallel
Solution

Friction resists movement. Kinetic (also called sliding or dynamic) friction resists movement in a direction opposite to the movement. Because it opposes movement, kinetic friction will eventually bring an object to a stop. An example is a rock that's sliding across ice.