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WorksheetsMechanical Systems Review #1
Total questions: 64
Worksheet time: 1hrs 29mins
This diagram is an example of what step in the engineering design process?
Make a model
Test a Model
Plan solutions
Reflect and Redesign
The only way to know if a design will work in real-world conditions is to build a prototype, based on the plan. This is part of which step in the Engineering Design Process?
Plan
Make a Physical Model
Iterate
Define the problem
During which step of the Design Process would the specific constraints or requirements of the challenge be identified?
Define the problem
Plan solutions
Reflect and Redesign
Test the model
blueprint
What is the Engineering Process?
A series of steps used to help solve problems or people who are facing challenges.
A series of steps used to break things down that are working properly.
A series of questions that make you think harder about life.
The steps we use to do science things in class.
This is an engineers' goal or objective - the work or function is must do.
constraint
criteria
invention
innovation
After testing your first prototype design you would __________.
imagine and plan
iterate
build a prototype
define the problem
Technological Development is influenced by (pick all that apply)
safety
society
science and engineering
environment
economics
Crash test dummies leading to safer cars is an example of what factor influencing technological development?
economics
society
environment
science and engineering
Inflation which has led to the development of cheaper car models is an example of what factor influencing technological development?
economics
society
environment
science and engineering
The consumer demand for Bluetooth enabled systems in cars is an example of what factor influencing technological development?
safety
society
environment
economics
The climate change crisis leading to development of electric cars is an example of what factor influencing technological development?
economics
society
environment
science and engineering
A mechanical device can do all of the following EXCEPT
Change the direction of force
Make it easier to do the work (force advantage)
Make it faster to do the work (speed advantage
Make it less work
Match the following simple machines
lever
pulley
inclined plane
wheel and axle
screw
wheel and axle
What class lever does this picture show?
1st
2nd
3rd
The nutcracker is the example of .......................
First Class of lever
Second Class of lever
Third Class of lever
Fourth Class of lever
How does a single fixed puled, like the one seen here, help you do work?
changes the direction of the force
increases the amount of effort force required
decreases the amount of effort force required
allows you to pull the rope a shorter distance
Which inclined plane will take less effort?
1
2
both
none
How does distance change the effort when using an inclined plane?
as distance increases, effort (INPUT FORCE) decreases
as distance decreases, effort (INPUT FORCE) decreases
as distance increases, effort (INPUT FORCE) increases
nothing, they both stay the same
What type of advantage does this lever give?
force
speed
neither
To increase the force advantage of a lever
make sure the fulcrum is in the middle of the lever
move the fulcrum closer to the load
move the fulcrum closer to the person
use a bigger fulcrum
If we gain a force advantage from using a simple machine, we will have to add more _____________ on our end.
force
distance
mechanical advantage
effort
When jacking up a car, Wei pushes with a force of 250 N on the handle of a jack and the jack applies a force of 3000 N to the car. What kind of advantage does this create?
force
speed
neither
The type of advantage in this inclined plane is
force
speed
neither
Which of the following levers has the largest force advantage?
Lever A
Lever B
Lever C
All 3 levers have the same force advantage
Look at the image below showing a forklift being used to load a truck. Suppose the motor on the forklift does not have enough force to carry the pallet of boxes up the ramp. How could the ramp be changed, if at all, so the forklift could perform the job?
steepen the ramp
shorten the ramp
lengthen the ramp
no change will help
Classify the gear trains
larger driving gear
speed advantage
gear ratio greater than 1
larger follower gear
force advantage
gear ratio less than 1
used for hauling loads and going uphill
used in racing
Which gear train provides more of a force advantage?
A
B
If the Input gear (Driver) was smaller and the output gear (follower) was larger what would happen to the speed of the follower gear?
Looking at the picture, what is the gear ratio (the arrow shows the driver gear)?
1.5
4.6
0.67
6.6
What is the Gear Ratio of the following gear train?
Follower gear: 8 teeth
driver gear: 32 teeth
4
0.25
8.32
32.8
Which of the following pics shows multiplying gears?
Which of the following pics shows a gear train with a speed advantage?
On the illustration, the number of the gear A teeth (driver) are 16, and the number of the gear B teeth are 40. Select one which shows correct gear ratio.
40-16
40+16
40/16
16/40
What is the gear ratio?
0.5
2
30
60
What type of gears are these called?
multiplying gears
reducing gears
parallel gears
What kind of advantage do these gears give you?
speed advantage
force advantage
no advantage
speed and force advantage
What type of gears are these called?
multiplying gears
reducing gears
parallel gears
# of teeth driver gear = 60
# of teeth follower gear = 36
What is the gear ratio?
0.6
96
1.7
24
In this gear train, the output speed for the follower gear_____. (Hint, the gear with the black handle is the driver gear)
increases.
decreases.
remains constant.
The scientific principle that makes hydraulic systems possible is
The fluid flow principle
Bernoulli’s principle
Pascal’s principle
Boyle’s law
Pneumatic systems use ...
gases that are not sealed in
gases that are sealed in
liquids that are not sealed in
liquids that are sealed in
Hydraulic systems use ________ to transfer force from one point to another.
Air
Liquid
Solid
Gas
A bicycle pump is an example of a ______________________.
Valve.
Pneumatic system.
Hydraulic system.
Piston.
Pressure is measured in what units
Newtons
m/s
Pascals
Moles
How are a hydraulic system and a pneumatic system similar?
Both use a gas.
Both use water.
Both use a fluid to apply force.
simple machines
Pneumatic devices transmit power using
inclined planes
levers
liquid under pressure
gas under pressure
If your load is placed at piston B, what type of advantage does this hydraulic system give you?
no advantage
force advantage
speed advantage
If you needed to lift a heavier load, what change could you make to piston A?
make it bigger
make it smaller
If you needed to lift a heavier load, what change could you make to piston B?
make it bigger
make it smaller
Which statement correctly describes pressure?
the applied force that acts on an object
force per unit area
the area to which a force is applied
force times surface area
If a force 20 N is applied to piston C. What is the pressure exerted to piston C?
1 N/cm2
4 N/cm2
100 N/cm2
5 N/cm2
What pressure does a 4000N force exert on the an area 10cm2?
40 N/cm2
400 N/cm2
10 N/cm2
100 N/cm2
What is the responding variable in the experiment described?
type of machine
effort force
load force
gear ration
What claim could you make from this data?
all simple machines produce a force advantage
all simple machines produce a speed advantage
different simple machines have different types of advantages
