| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.85 |
| Score | 0% | 57% |
What's the first gear in a gear train called?
driven gear |
|
driver gear |
|
idler gear |
|
input gear |
A gear train is two or more gears linked together. Gear trains are designed to increase or reduce the speed or torque outpout of a rotating system or change the direction of its output. The first gear in the chain is called the driver and the last gear in the chain the driven gear with the gears between them called idler gears.
Normal force is generally equal to the __________ of an object.
mass |
|
weight |
|
density |
|
coefficient of friction |
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.
Which of the following is not a type of simple machine?
gear |
|
lever |
|
screw |
|
pulley |
The six types of simple machines are the lever, wheel and axle, pulley, inclined plane, wedge, and screw.
| 48 psi | |
| 8 psi | |
| 16 psi | |
| 14.4 psi |
According to Boyle's Law, pressure and volume are inversely proportional:
\( \frac{P_1}{P_2} \) = \( \frac{V_2}{V_1} \)
In this problem, V2 = 45 ft.3, V1 = 60 ft.3 and P1 = 12.0 psi. Solving for P2:
P2 = \( \frac{P_1}{\frac{V_2}{V_1}} \) = \( \frac{12.0 psi}{\frac{45 ft.^3}{60 ft.^3}} \) = 16 psi
Which of these will have the most impact on the kinetic energy of an object?
its weight |
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its speed |
|
its mass |
|
its direction |
Kinetic energy is the energy of movement and is a function of the mass of an object and its speed: \(KE = {1 \over 2}mv^2\) where m is mass in kilograms, v is speed in meters per second, and KE is in joules. The most impactful quantity to kinetic energy is velocity as an increase in mass increases KE linearly while an increase in speed increases KE exponentially.