Font size
WorksheetsPOE Review
Total questions: 46
Worksheet time: 49mins
1st Class Lever
fulcrum is between the load and effort
load is between the effort and fulcrum
effort is between the load and fulcrum
2nd Class Lever
fulcrum is between the load and effort
load is between the effort and fulcrum
effort is between the load and fulcrum
3rd Class Lever
fulcrum is between the load and effort
load is between the effort and fulcrum
effort is between the load and fulcrum
What is my MA?
(a)
If I apply a force of 3 lb, what is the load?
(a)
If the 6” diameter axle on a car turns a
24” diameter wheel, what is the
mechanical advantage?
(a)
The pulley system shown below is used to lift a
load of 100 lbs. How much effort must be
applied?
(a)
The pulley system shown below is used to lift a
load of 100 lbs. If the rope travels 25’, how high does the load rise?
(a)
What is the gear ratio
between gear A and B?
(a)
What is the gear ratio
between gear C and D?
(a)
Find gear ratio
(a)
Find the driver's speed
(a)
Find the driver's torque
(a)
Find the driver's diameter.
(a)
Find the gear ratio.
(a)
If the output gear D is spinning at 10 revolutions per minute,
how fast is the input gear a turning?
(a)
What is the IMA of the inclined plane above?
(a)
What is the IMA of the wedge on the right?
(a)
What is the IMA of the a 1/4 in screw with 20 TPI?
(a)
Energy Sources
Fossil fuels
Uranium
Animal
Food
Biomass
Hydroelectric/tidal
Geothermal
Wind
Solar
A motor lifts a 20 lb weight a distance of 3 feet in
12 seconds. While lifting, voltage was recorded
as 12V and current was 1.5 A. What is the
motor’s efficiency?
(a)
Circuits
Current same
everywhere
Resistance adds to total
resistance
Voltage adds to total
voltage
Voltage same
everywhere
Current adds to total
current
total resistance (RT
) is
equal to the reciprocal of
the sum of the
reciprocal
Fill in the Table.
Symbols are in ( ).
A
(C)
(I)
(A)
(V)
(Ω)
R
I
C
V
A circuit contains a 6 V battery and three resistors connected in parallel with each other and with the battery.
R1 = 2 Ω
R2 = 3 Ω
R3 = 6 Ω
What is RT ?
(a)
What is the total voltage across a series circuit with three resistors of 2 ohms, 3 ohms, and 5 ohms, if the current flowing through the circuit is 1 ampere?
10 volts
5 volts
15 volts
20 volts
If a parallel circuit has a total current of 6 amperes and consists of three branches with equal resistance, what is the current through each branch?
2 amperes
3 amperes
1 ampere
6 amperes
What is the equivalent resistance of a series circuit with resistors of 4 ohms, 6 ohms, and 10 ohms?
20 ohms
10 ohms
4 ohms
6 ohms
In a parallel circuit, if one branch has a resistance of 8 ohms and another branch has a resistance of 4 ohms, what is the total resistance of the circuit?
2.67 ohms
12 ohms
3 ohms
6 ohms
Match the following
Convection
movement of air
Conduction
movement thru objects
through touching
Radiation
electromagnetic waves
Design Process Steps
(a)
(b)
(c)
(d)
(e)
Present Solution
center of gravity or center of mass.
Centroid
Moment of Inertia
Modulus of Elasticity
Stiffness of an object related to its shape.
Centroid
Moment of Inertia
Modulus of Elasticity
Ratio of stress to strain. Inherent to the material.
Centroid
Moment of Inertia
Modulus of Elasticity
Vectors have _________ and __________
What is the x component?
(a)
What is the y component?
(a)
A (a) is a push or pull exerted by one object on another.
A (b) force expands or lengthens the object it is acting on.
A (c) force compresses or shortens the object it is acting on.
•A moment with a tendency to rotate counter clockwise (CCW) is considered to be a (a) moment.
•A moment with a tendency to rotate clockwise (CW) is considered to be a (b) moment.
FBDs are used to illustrate and calculate forces acting upon a given body.
Solve
(a)
Material Composition - Elements
Good conductors of heat
Good conductors of electricity
Hard
Shiny
Reflect Light
Most are gases at room temperature
Dull
Brittle
Powdery
Poor conductors of heat
Poor conductors of electricity
Possess both metallic and nonmetallic properties
A measure of a material’s ability to regain its original dimensions after the removal of a load or force.
Proportional Limit
Yield Point
Ultimate Strength
Modulus of Elasticity
The point at which a maximum load for a sample is achieved. Beyond this point elongation of the sample continues, but the force exerted decreases.
Proportional Limit
Yield Point
Ultimate Strength
Modulus of Elasticity
The point at which a sudden elongation takes place, while the load on the sample remains
the same or actually drops. If the force applied to the material is released, the material will not return to its original shape.
Proportional Limit
Yield Point
Ultimate Strength
Modulus of Elasticity
Greatest stress a material is capable of withstanding without deviation from straight line proportionality between the stress and strain. If the force applied to a material is released, the material will return to its original size and shape.
Proportional Limit
Yield Point
Ultimate Strength
Modulus of Elasticity
A 1” diameter piece of steel is 15 feet long. If the total tensile load in the steel is 125,000 pounds and the modulus of elasticity is 30,000,000 psi, calculate using the 5 step engineering process: Find the tensile stress.
175023 psi
120724 psi
159155 psi
145785 psi
