Mechanics Flashcards
Power formula
P= force x velocity
Work formula
W= force x displacement
Coefficient of friction formula
Fc= Frictional force/ normal force
What is a responding force called?
Friction
What is speed with direction called?
Velocity
The tendency of all objects at rest to stay at rest is called?
Inertia
What is the definition of energy?
The ability to do work
What can be considered a prime mover that converts electric energy to mechanical energy?
Electric motor
What does BTU measure?
Heat
What’s the name for when an applied force can extend and object before permanent distortion occurs?
The elastic limit
The amount of distortion produced on an object is proportional to the force applied to it for object ______ than the elastic limit.
Less than
Force per unit area is called?
Pressure
Pressure at any point in a confined fluid is distributed everywhere with or without being lessened anywhere?
Without being lessened
Absolute pressure per square inch is represented how?
psia
If a pipe was longer would the friction head (pressure loss) be greater or smaller?
Greater
What must happen for the syphon to resume flow?
Must be filled with liquid
When the effort arm on a lever is longer than the resistance arm what effect does it have?
Multiplies the the force
A fraction of what tells you a machine requires greater effort than resistance being moved?
Less than one but greater than 0
What’s the equation to find the effort to push something along an incline ramp?
Distance divided by height
The cam wedge can change ____/_____ motion to reciprocating motion.
Rotary/ linear
Comparing mechanical advantage to ideal for a machine what can you determine?
The mechanical efficiency
What is a combination of 2 or more machine parts working together called?
Mechanism
Bell crank consists of at least ____ rotary holes and ___ fixed holes?
2 rotary holes and 1 fixed pivot hole
For a lever linkage, if the longest side of a 4 bar linkage is fixed it is called ?
Beam-and-crank linkage
Can and follower mechanisms convert what two typed of motions to oscillating and intermittent motion?
Linear and rotary
What mechanism can lock rotating machine parts to produce rotation in one direction?
Ratchet and pawl mechanism
The smaller the range of an instrument, the greater the ____?
sensitivity
What is a probe with a contact element and a sensing element called?
Transducer
What tachometer uses light frequency to find rpm?
Stroboscopic tachometer
Flow meter with clamp on sender requires what in the liquid in order to work?
Bubbles or small solids
What type of leak detector can be used to find pin hole leaks in pressurized systems?
Ultrasonic leak detector
_____wrench jaws tend to slip and loosen.
Adjustable
What type of saw is the basic metal cutting tool
Hacksaw
What type of snips is used to cut heavy duty steel sheets?
Bulldog snips
What are a pliers purpose?
Bending, pulling, holding, squeezing
What type of pliers are useful when welding?
Locking pliers
What type of platform should be used when working with electric power tools to prevent electric shock?
Insulated platform
Using grinders you should wear what?
Face shield, goggled
What has special sockets made of high grade steel?
Electric Impact
Pneumatic tools should never be operated unless the bit is _____?
I’m contact with the work surface
What should you do when making adjustments to power tools?
Unplug from power source
Locking nuts are classified as what?
Prevailing-torque nuts
Free spinning nuts must be what before locking action occurs?
tightened fully
Safety wiring is a method where you two or more fasteners are wired together in a way where loosening one results in _____ the other.
Tightening
Woodruff keys are machined to a half-round shape and keeps the key from____?
Slipping out of place
Lead on a screw is equal to what?
The pitch
What is the “lost” energy turned into for a machine?
Heat
What type of wear on parts of a machine occurs when surface appears burnished to a high luster and looks irregular to the naked eye?
Adhesive wear
