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Mechanical Comprehension Study Guide
Terms in this set (36)
Which pulleys provide the mechanical advantage?
R)/d ; r =R
D: # of teeth on gear A
R: revolutions of gear A
d: number of teeth on gear B
r: revolutions of gear B
Use floats to measure specific gravity. Specific gravity is the weight of a liquid compared with the weight of the water. The liquid with the highest specific gravity will cause the float to rise higher in the glass tube
First Class- Fulcrum is in the middle (scissors, pliers)
Second Class- Fulcrum is at one end, load is in between (nutcracker, wheelbarrow)
Third Class- Fulcrum is at one end, effort is in between (tongs, tweezers)
the smaller pulley will turn faster than those larger than it. It has to "keep up" and therefore turns faster
Mechanical advantages in pistons
smaller D/ Bigger = mechanical advantage
Axe is classified as what?
wedge, inclined plane
The farther away the fulcrum is from the resistant arm, the ___________ amount of force that is required to lift the weight and the higher the resistance rm will travel
No electricity flows through burnt out bulbs, but a voltimeter can bypass it if is connected on both sides. what does it do
It tells you the total voltage in a circuit
Current stays the same in series
Current is constant in series, voltage is not
Voltage is constant in parallel, current is not
The circuit with the greater resistance is usually in series, because it forces the current through all resistors
In a 2 pulley system, the movable pulley will only move up _________ the distance , and spin ________as much as the fixed pulley
To find an rpm necessary
take number of rods on the wheel, divide that from the needed contacts per minute. (ex. twice per second = 120 contacts per minute. 10 projection rods on wheel. 120/10= 12.
Must rotate at 12 rpm.
If a driver wheel is present, the ___________ wheels will rotate according to how close to the center the ___________ wheel makes contact with them. The closer to the ___________, the faster it will move.
By increasing the length of the _________ arm, the effort is _________ enabling a valve to blow off at a higher pressure. Move the weight further away to do this.
The one with the longer string takes the longest to complete 1 swing
The weight doesn't matter for swing time. If string length is the same, swing time is the same
If a board is placed in the water with 1 weight at a time at each end, the end with the weight closest to the _________ will tend to float _______ than the one furthest from the center
If weights hang from a string attached to a bar, _________ pull is exerted by the weight of ______ weight. The length of the string doesn't matter.
The deeper you go with an inflated ball, the more difficult it is to hold it under water
The deeper you go with the same ball, the more buoyant the ball is
Rate of heat exchange is __________ through objects of greater temperature difference.
Water flows __________ through narrower areas than it does through wider
faster, think of putting thumb on hose
But the same amount of water will flow through the smaller and larger part of the pipe in a given time
If you place an object evenly on 2 scales, each scale will read ______ of the total weight
Wheel and axle question, such as bucket being raised from well
Mechanical advantage = Radius of Axle to handle/ radius of drum
Make sure your using radius and not diameter
pressure = force / area
Statics and equilibrium
Moment = Force * Distance
The difference between kinetic between kinetic and potential
Potential- energy stored in an object
Kinetic- energy in motion
V = I * R;finds voltage drop across a circuit or single resistor
I = Q/T; current = charge / time
Direct- flows continuously in the same direction
Alternating- periodically reverses direction
Ammeter- measures current flow in a circuit
Voltmeter- measures voltage
Multimeter- measures both
Charge = coulomb, C
Current flow = ampere, A
Volts * Amperes
Ideas MA = (2
length of handle)/(pitch of thread)
First - Object in motion will stay in motion, object at rest will stay at rest
Second- force = mass * acceleration
Third- for every action there is an equal and opposite reaction
W = mass * gravity
CONVENTION- occurs in liquids and gases by circulating currents caused by a difference in density
CONDUCTION- occurs in solids and stationary fields
Placing salt into water increases the specific gravity of the solution and lowers its freezing point
Heating a closed container of boiling water increases the pressure of water vapor (steam) inside the container and increases the temperature of the water
ALWAYS moves from hot object to cold object
The rate of transfer is greater for the greater temperature difference
Compressing air in a closed space will ___________ the volume and __________ the temperature
If springs are holding up a box
A.) 2 springs holding the box attached as 1 longer spring
B.) 2 springs holding the box at different ends of the box
A.)They are each holding the entire weight of the box
B.)Each spring holds 1/2 the weight of the box
A square metal plate is hanging by 4 wires (one in each corner). one breaks, and its hanging by only 3 wires now. Does each wire now carry the same amount that is more than the lone wolf in the other corner?
The lone wolf does no support. The 2 diagonal supports cant hold it alone
Aircraft will take off on a treadmill, regardless of treadmill setting. True or False?
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