The best definition for drag is __________.
A. a responsive force that affects the movement of an object through a fluid
B. a responsive force that only affects movement on a solid
C. a responsive force that only affects movement in air
D. the internal stretch force of a material
How can workers increase the mechanical advantage of pulley systems?
A. Using longer stretches of rope.
B. Using a higher platform for the load in need of lifting.
C. Using additional pulleys to further distribute weight.
D. Decreasing load size and weight.
An "inclined plane" is a commonly used implement and has many applications, including handicap access.
What is the most common name for an inclined plane?
A. A pulley system
B. A lever
C. A ramp
D. A series of gears
What determines the speed of an output gear?
A. None of these (Gear speed is not capable of alteration.)
B. The size of gears.
C. The speed of the input gear and the ratio of the number of teeth on each gear.
D. The ratio of companion gears.
What are the potential functions of gear systems?
A. Gears may be used to change direction in machinery and can be used to increase speed.
B. Gears possess a single function: transmitting motion.
C. The potential functions of gears are: changes in direction, speed changes (both increases and decreases), and motion transmission.
D. Gears are primarily used for making changes in speed, but may also be used to instigate motion in machinery.
If a mechanical device is reported to have an advantage of 2, what does this mean?
A. The number "2" describes the effectiveness of the machine.
B. This means the device allows users to complete twice the amount of work with the same amount of effort used to complete a task without assistance.
C. The number refers to the speed of the device in question.
D. This means that the device requires twice the amount of effort to complete the same amount of work.
What are the three components of a lever?
A. Resistance arm and effort arm
B. A point of origin and solid plane
C. A wide plane, fulcrum, and effort arm
D. Fulcrum, resistance arm, and effort arm
What determines the speed of a pulley system?
A. The material used as the belt (such as leather and rubber).
B. The size of the pulleys as a whole.
C. The size and ratio of all pulleys involved.
D. The length of the rope or belt used in the pulley system.
Pulley systems require the synchronized movement of all pulleys.
How can pulleys escape this rule?
A. To violate this rule, pulley systems may be used in conjunction with gears.
B. This rule cannot be effectively violated.
C. To violate this rule, pulley system belts must be reversed.
D. Pulleys using twisted belts may move in opposing directions.
To move an object across a surface, which system requires little input from the user, yet creates extreme force?
A. A conveyor belt, as those found in factories.
B. Any form of mechanical device.
C. wheel and axle system, as found in vehicles.
D. A pulley system, as might be found in warehouses and shipyards.
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