ASVAB Mechanical Comprehension Practice Test 229725 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.42
Score	0%	68%

Review

Which of these is the formula for force?

77% Answer Correctly

	F = am²
	F = m/a
	F = ma
	F = a/m

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 If input effort is 300 ft⋅lb, what output effort will be produced by a machine with a mechanical advantage of 8?

79% Answer Correctly

	4800ft⋅lb
	2400 ft⋅lb
	600ft⋅lb
	9600ft⋅lb

Solution

Mechanical advantage is the ratio of output force to input force and tells us by how many times a machine multiplies input effort. So, a machine with a mechanical advantage of 8 will multiply an input effort of 300 ft⋅lb by 8 to produce an output effort of 2400 ft⋅lb.

Which of the following is the formula for gravitational potential energy?

62% Answer Correctly

	\(PE = mgh\)
	\(PE = { 1 \over 2} mv^2\)
	\(PE = mg^2h\)
	\(PE = { 1 \over 2} mg^2\)

Solution

Gravitational potential energy is energy by virtue of gravity. The higher an object is raised above a surface the greater the distance it must fall to reach that surface and the more velocity it will build as it falls. For gravitational potential energy, PE = mgh where m is mass (kilograms), h is height (meters), and g is acceleration due to gravity which is a constant (9.8 m/s²).

According to Boyle's law, for a fixed amount of gas kept at a fixed temperature, which of the following are inversely proportional?

63% Answer Correctly

	pressure, density
	density, volume
	volume, mass
	pressure, volume

Solution

Boyle's law states that "for a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional".

Normal force is generally equal to the __________ of an object.

62% Answer Correctly

	weight
	mass
	coefficient of friction
	density

Solution

Normal force arises on a flat horizontal surface in response to an object's weight pressing it down. Consequently, normal force is generally equal to the object's weight.