| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.04 |
| Score | 0% | 61% |
Which of the following is not a type of simple machine?
lever |
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screw |
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gear |
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pulley |
The six types of simple machines are the lever, wheel and axle, pulley, inclined plane, wedge, and screw.
Which of the following represents the force a surface exerts when an object presses against it?
friction |
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counter force |
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mass |
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normal force |
Normal force (FN) represents the force a surface exerts when an object presses against it.
Friction resists movement in a direction __________ to the movement.
normal |
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parallel |
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opposite |
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perpendicular |
Friction resists movement. Kinetic (also called sliding or dynamic) friction resists movement in a direction opposite to the movement. Because it opposes movement, kinetic friction will eventually bring an object to a stop. An example is a rock that's sliding across ice.
Boyle's law defines the relationship between pressure and volume as:
\(\frac{P_1}{P_2} = \frac{V_2}{V_1}\) |
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\(\frac{P_1}{P_2} = {V_1}{V_2}\) |
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\({P_1}{P_2} = {V_1}{V_2}\) |
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\(\frac{P_1}{P_2} = \frac{V_1}{V_2}\) |
Boyle's law states that "for a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional". Expressed as a formula, that's \(\frac{P_1}{P_2} = \frac{V_2}{V_1}\)
The work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle. This defines which of the following?
conservation of mechanical energy |
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work-energy theorem |
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Pascal's law |
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mechanical advantage |
The work-energy theorem states that the work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle. Simply put, work imparts kinetic energy to the matter upon which the work is being done.