ASVAB Mechanical Comprehension Practice Test 867602 Results

Your Results Global Average
Questions 5 5
Correct 0 3.28
Score 0% 66%

Review

1 If A = 9 ft. and the green box weighs 45 lbs. what is the torque acting on the A side of this lever?
75% Answer Correctly
0 ft⋅lb
1215 ft⋅lb
135 ft⋅lb
405 ft⋅lb
Solution
For a lever, torque is weight x distance from the fulcrum which, in this case, is: 45 ft. x 9 lbs. = 405 ft⋅lb
2

Which class of lever offers no mechanical advantage?

45% Answer Correctly

first

second

third

none of these, all levers offer mechanical advantage
Solution

A third-class lever is used to increase distance traveled by an object in the same direction as the force applied. The fulcrum is at one end of the lever, the object at the other, and the force is applied between them. This lever does not impart a mechanical advantage as the effort force must be greater than the load but does impart extra speed to the load. Examples of third-class levers are shovels and tweezers.

3

A shovel is an example of which class of lever?

56% Answer Correctly

third

a shovel is not a lever

first

second
Solution

A third-class lever is used to increase distance traveled by an object in the same direction as the force applied. The fulcrum is at one end of the lever, the object at the other, and the force is applied between them. This lever does not impart a mechanical advantage as the effort force must be greater than the load but does impart extra speed to the load. Examples of third-class levers are shovels and tweezers.

4

The standard unit of energy is the:

73% Answer Correctly

Volt

Watt

Horsepower

Joule
Solution

The Joule (J) is the standard unit of energy and has the unit \({kg \times m^2} \over s^2\).

5

The force required to initally get an object moving is __________ the force required to keep it moving. 

76% Answer Correctly

the same as

higher than

opposite

lower than
Solution

For any given surface, the coefficient of static friction is higher than the coefficient of kinetic friction. More force is required to initally get an object moving than is required to keep it moving. Additionally, static friction only arises in response to an attempt to move an object (overcome the normal force between it and the surface).