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WorksheetsPrinciples of Machines: Mechanisms vs. Machines
Total questions: 67
Worksheet time: 36mins
Mechanisms and machines are different because:
mechanisms transfer or transform motion without adding energy, while machines do work by using energy
machines transfer or transform motion without adding energy, while mechanisms do work by using energy
both mechanisms and machines do the same work
mechanisms and machines are always the same
A machine is:
A living organism
A device that makes work easier
A type of food
A natural resource
A mechanism is a piece or part of ______ such as gears, brakes, or springs.
machinery
furniture
clothing
food
A mechanism transforms one form of ______ into another.
motion
energy
force
matter
Machines use or apply ______ energy.
mechanical
thermal
electrical
chemical
Machines have several parts, each with their own ______.
function
color
height
sound
Simple machines have few or no ______ parts.
moving
electrical
chemical
digital
The input force applied to a simple machine is called ______.
effort
load
resistance
output
The output force performed by a simple machine is called ______.
load
effort
power
work
Levers are movable bars which ______ on a fulcrum attached to a fixed point.
pivot
slide
rotate
hang
The pivot points of a lever are called ______.
fulcrums
axles
joints
hinges
Which class of lever has the fulcrum between the effort and the load?
First class
Second class
Third class
Which class of lever has the load between the fulcrum and the effort?
First class
Second class
Third class
Which class of lever has the effort between the fulcrum and the load?
First class
Second class
Third class
A seesaw is an example of a ________ lever.
first class
second class
third class
fourth class
A wheelbarrow is used as a ________ class lever.
second
first
third
fourth
Tweezers are an example of a (a) class lever.
What is the function of a pulley in a simple machine?
To increase speed
To change the direction of force applied
To generate electricity
To store energy
Which of the following is an example of a fixed pulley?
Crane lift
Elevator
Flagpole
Bicycle wheel
Movable pulleys have the load attached to the ______ wheel, and both can move.
grooved
solid
spoked
flat
Compound pulleys are a combination of a fixed pulley and a ______ pulley.
movable
rotating
simple
heavy
Which of the following is an example of a compound pulley?
Flagpole
Crane lift
Elevator
Bicycle wheel
Wheels and axles consist of a bar or shaft on which a wheel or other rotating component ______.
revolves
expands
melts
shrinks
What is the main function of wheels and axles in simple machines?
To store energy
To distribute the input force equally to attached components
To change direction
To increase friction
Inclined planes have smooth ______ surfaces used to reduce the force necessary to move objects upward.
sloped
rough
flat
sticky
Using an inclined plane requires ______ input force to achieve a given output force than if the inclined plane is not used.
less
more
equal
no
What does a wedge consist of?
One inclined plane
Two inclined planes, creating a thin end and a thick end
A cylinder
Rotational motion
Which of the following is an example of a wedge?
Screwdriver
Shovel
Pulley
Wheel
A screw is an inclined plane wrapped around a _________
cylinder
cube
sphere
pyramid
What type of motion do screws convert rotational motion into?
Circular motion
Linear motion
Oscillating motion
Vibrational motion
What is a compound machine?
A machine made of only one part
A machine that consists of two or more simple machines
A machine that uses electricity
A machine that cannot be moved
Fill in the blank: Compound machines are used to make work easier over a ______ distance.
shorter
longer
greater
wider
Which of the following is an example of a compound machine?
Scissors
Hammer
Screwdriver
Nail
What do gears do?
Change direction of motion
Change output speed or torque
Only move in straight lines
Can be found in vehicle transmissions
Fill in the blank: Wheels with ______ interact with teeth of another wheel to change transmitted rotary motion.
teeth
handles
spokes
belts
Where can sprockets be found?
Bicycles
Cars
Airplanes
Boats
What is the essential question for Machine & Mechanism Calculations?
Fill in the blank: Measure of energy ______ occurring when an object is moved over a distance by an external force.
transfer
creation
loss
storage
What is the formula for work?
W = f × d
W = m × a
W = v × t
W = p × t
Work is measured in which of the following units?
Joules (J)
Kilograms (kg)
Meters (m)
Newtons (N)
Force is measured in (a) or newtons (N).
Distance is measured in ______.
meters (m)
seconds (s)
kilograms (kg)
liters (L)
Which of the following is the correct formula for work?
W = f + d
W = f × d
W = d / f
W = f - d
What is the rate of performing work called?
(a)
Power is measured in which units?
Neurons
Watts or joules/second
Meters
Pascals
Fill in the blank: The formula for power is P = __ / t.
W
F
V
Q
In the formula P = W / t, what does 'W' stand for and what is its unit?
Work, measured in joules (J) or kgm^2/s^2
Watt, measured in newtons (N)
Weight, measured in kilograms (kg)
Wavelength, measured in meters (m)
Mechanical efficiency measures system performance using which formula?
(Output Work / Input Work) × 100
(Input Work / Output Work) × 100
(Input Work × Output Work) × 100
(Output Work - Input Work) × 100
Which of the following can improve mechanical efficiency?
Increasing friction
Adding lubrication
Increasing vibration
Increasing costs
Mechanical efficiency is reduced by friction, vibration, and excess motion.
True
False
What is the formula for Mechanical Advantage (MA) as described in the Principles of Machines?
MA = Fo / Fi
MA = Fi / Fo
MA = Fo x Fi
MA = Fi - Fo
In the context of machines, what does Fo represent?
Fo = output force, measured in newtons (N)
Fo = input force, measured in joules (J)
Fo = frictional force, measured in watts (W)
Fo = operational frequency, measured in hertz (Hz)
In the context of machines, what does Fi represent?
Fi = input force, measured in newtons (N)
Fi = output force, measured in joules (J)
Fi = frictional force, measured in newtons (N)
Fi = input frequency, measured in hertz (Hz)
Mechanical Advantage includes the amount of input force used to overcome friction.
True
False
Which of the following best describes a machine with a Mechanical Advantage greater than 1?
The machine changes the direction of force
The machine is a force multiplier and runs very efficiently
The force is not multiplied, but distance and speed are increased
What is the formula for Ideal Mechanical Advantage (IMA) as described in the Principles of Machines?
IMA = di / do
IMA = do / di
IMA = di * do
IMA = di + do
Ideal Mechanical Advantage (IMA) includes inefficiencies such as friction.
True
False
Fill in the blank: di = ______ distance, measured in meters (m).
input
output
focal
object
Fill in the blank: do = ______ distance, measured in meters (m).
output
input
total
average
What does the drive ratio relay information about?
The color of the gears
The speed and acceleration capabilities of an object
The weight of the machine
The temperature of the engine
The answer for drive ratio is written as a ______, like x:1.
ratio
fraction
decimal
percentage
If the drive ratio is 1:1, the engine and gear spin at ______ speeds.
equal
different
half
double
What is the formula for the ratio of the output speed to the input speed?
Ws/We or Ze/Zs
We/Ws or Zs/Ze
Ws*We or Ze*Zs
Ws+We or Ze+Zs
Ws is the ______ speed, measured in revolutions per minute (rpm).
output
input
average
maximum
We is the input speed, measured in ______ per minute (rpm).
revolutions
meters
watts
seconds
Ze is the number of driving gear ______.
teeth
shafts
wheels
links
Zs is the number of ______ gear teeth.
driven
driving
idler
input
