| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.05 |
| Score | 0% | 61% |
A truck is using a rope to pull a car. Tension in the rope is greatest in which of the following places?
near the car |
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near the truck |
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in the middle |
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tension is equal in all parts of the rope |
Tension is a force that stretches or elongates something. When a cable or rope is used to pull an object, for example, it stretches internally as it accepts the weight that it's moving. Although tension is often treated as applying equally to all parts of a material, it's greater at the places where the material is under the most stress.
The science that deals with motion and the forces that produce motion is called which of the following?
engineering |
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aeronautics |
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mechanics |
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physics |
Mechanics deals with motion and the forces that produce motion.
The mechanical advantage of a block and tackle is equal to which of the following?
the number of loads |
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the number of connecting ropes |
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the number of pulleys |
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the number of input forces |
Two or more pulleys used together constitute a block and tackle which, unlike a fixed pulley, does impart mechanical advantage as a function of the number of pulleys that make up the arrangement. So, for example, a block and tackle with three pulleys would have a mechanical advantage of three.
Which of the following is not a type of bridge?
cable |
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arch |
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truss |
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block |
The six basic bridge forms are beam, truss, arch, cantilever, cable, and suspension.
What's the first gear in a gear train called?
input gear |
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driver gear |
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idler gear |
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driven 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.