| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.99 |
| Score | 0% | 60% |
The science that deals with motion and the forces that produce motion is called which of the following?
physics |
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mechanics |
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aeronautics |
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engineering |
Mechanics deals with motion and the forces that produce motion.
Which of the following represents how much two materials resist sliding across each other?
static friction |
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kinetic friction |
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coefficient of friction |
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normal friction |
Coefficient of friction (μ) represents how much two materials resist sliding across each other. Smooth surfaces like ice have low coefficients of friction while rough surfaces like concrete have high μ.
| -1 | |
| 0.83 | |
| 5 | |
| 1 |
The mechanical advantage of a wheel and axle is the input radius divided by the output radius:
MA = \( \frac{r_i}{r_o} \)
In this case, the input radius (where the effort force is being applied) is 5 and the output radius (where the resistance is being applied) is 6 for a mechanical advantage of \( \frac{5}{6} \) = 0.83
| 8 | |
| 24 | |
| 8.8 | |
| 7.2 |
The mechanical advantage (MA) of a wedge is its length divided by its thickness:
MA = \( \frac{l}{t} \) = \( \frac{40 in.}{5 in.} \) = 8
When it comes to force, mass and acceleration have what kind of relationship?
inverse |
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logarithmic |
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linear |
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exponential |
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.