ASVAB Mechanical Comprehension Practice Test 538695 Results

Your Results Global Average
Questions 5 5
Correct 0 3.17
Score 0% 63%

Review

1 If the green box weighs 65 lbs. and 10 lbs. of force is applied 5 ft. from the fulcrum at the blue arrow, how far from the fulcrum would the green box need to be placed to balance the lever?
55% Answer Correctly
0.77 ft.
13 ft.
1.54 ft.
0.19 ft.
Solution

To balance this lever the torques at the green box and the blue arrow must be equal. Torque is weight x distance from the fulcrum so the equation for equilibrium is:

Rada = Rbdb

where a represents the green box and b the blue arrow, R is resistance (weight/force) and d is the distance from the fulcrum.

Solving for da, our missing value, and plugging in our variables yields:

da = \( \frac{R_bd_b}{R_a} \) = \( \frac{10 lbs. \times 5 ft.}{65 lbs.} \) = \( \frac{50 ft⋅lb}{65 lbs.} \) = 0.77 ft.

2

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

57% Answer Correctly

aeronautics

mechanics

physics

engineering
Solution

Mechanics deals with motion and the forces that produce motion.

3

Which of the following statements about drag is false?

58% Answer Correctly

drag occurs during movement through a fluid

the amount of drag depends on the shape of an object

the amount of drag depends on the speed of an object

slower objects experience more drag than faster objects
Solution

Drag is friction that opposes movement through a fluid like liquid or air. The amount of drag depends on the shape and speed of the object with slower objects experiencing less drag than faster objects and more aerodynamic objects experiencing less drag than those with a large leading surface area.

4 What's the mechanical advantage of a wedge that's 5 inches wide and 20 inches long?
83% Answer Correctly
8
1
4
5.5
Solution

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

MA = \( \frac{l}{t} \) = \( \frac{20 in.}{5 in.} \) = 4

5

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

66% Answer Correctly

exponential

inverse

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.