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8: Test Your Knowledge
What two types of systems are designed, built, and maintained by mechanical engineers?
The push or pull on an object resulting from contact with another object is _______.
_______ is the application of force to move an object a distance.
The rate at which work is performed is _______.
Describe the difference between potential and kinetic energy.
Give the definition for each of the following types of motion.
A. Linear motion.
B. Rotary motion.
C. Reciprocating motion.
D. Oscillating motion.
A(n) _______ is a simple machine that uses a stiff bar rested on a fulcrum, or pivot, to lift or move a load.
A(n) _______ is a simple machine that gains mechanical advantage by moving the object a longer distance while using less force.
True or False?
Mechanical power systems use components such as gears, pulleys, and belts to transmit power.
A. True
B. False
_______ systems use liquid to transmit power, while _______ systems use air.
What are the two most common power sources in fluid power systems?
_______ are devices that mesh with similar devices to transmit power.
In a mechanical power system, a(n) _______ is a cylindrical piece used to transfer rotary motion.
A forklift raises a 400-lb stack of shingles 12′ in the air. How much work has been done?
Calculate how much force would be generated in a fluid power cylinder with an area of 0.5 in2 operating at 120 psi.
Calculate the horsepower provided by the forklift, if the shingles in Question 14 are raised in 3 minutes.
Determine the gear ratio of a gear set in which the driver gear has 60 teeth and the driven gear has 15 teeth.
Calculate the ideal mechanical advantage that is provided by the following simple machine. One end of a 15′ ramp is placed on the ground and the other is placed on a loading dock that is 3′ above the ground. How much effort would be required to push a 150-lb box up the ramp?
Determine the efficiency of the previous machine, if it required 34 lb to push the 150-lb box up the ramp.
Give at least two applications of mechanical power.
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