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WorksheetsMechanical System Setion one
Total questions: 37
Worksheet time: 37mins
Which of the following is NOT one of the things a machine can do?
Changes the amount of force required.
Changes the distance over which the force is exerted.
Changes the direction of the force.
Changes the amount of work done.
The fixed point around which a lever rotates is know as the
wheel.
fulcrum.
input force.
output force.
Which of the following is NOT an example of the simple machine know as a screw?
lid of a jar
turning on and off a faucet
a drill bit
a screw driver
How can simple machines make work easier?
by decreasing the force needed to complete the task
by increasing the friction between the machine and the object
by adding more work on the object than originally applied
by removing the force of gravity on the object
Which simple machine would be the MOST efficient for lifting an object 30 meters off the ground?
inclined plane
screw
wedge
lever
A doorknob is a simple machine made up of 2 circular objects of different sizes. When turning a doorknob, what type of simple machine is being used?
inclined plane
wheel and axle
wedge
pulley
Workers push a heavy box up an inclined plane and onto a moving truck. Which best explains why these workers use an inclined plane?
It makes their work easier because it requires less effort.
It decreases the amount of work they have to do.
It increases the amount of friction necessary to do the task.
It makes the box weigh less.
A group of workers needs to move a piano from the second floor of a building. The piano is too wide to fit through the doorway, so they will lower the piano to the ground through a window. Which simple machine would be the best to help the workers lower the piano from the window?
wheel and axle
inclined plane
pulley
wedge
The place where a lever pivots is called the _______.
Force / Effort
Fulcrum
Load
Rigid Bar
Using the back of a hammer makes it much easier to remove a nail from a wooden board. What kind of simple machine would the hammer be classified as if you are using it for this purpose?
Wedge
Lever
Pulley
Inclined Plane
The nutcracker is the example of .......................
First Class of lever
Second Class of lever
Third Class of lever
Fourth Class of lever
What class of lever is a pair of tweezers?
First class lever
Second class lever
Third class lever
A lever is designed to
decrease the amount of force required to do work
decrease the amount of time required to do work
increase the amount of energy needed to work
decrease the amount of work done
What class of lever is a fishing rod?
First class lever
Second class lever
Third class lever
What class of lever is a pair of pilers?
First class lever
Second class lever
Third class lever
What class of lever is a broom?
First class lever
Second class lever
Third class lever
What class of lever does this picture show?
First class lever
Second class lever
Third class lever
Making a _________________change is one of the easiest ways to change mechanical advantage in a mechanism or system to achieve the desired speed and/or torque.
gear teeth
Gear Ratio
drastic
position
What do we call the gear connected to the input power source, such as a motor?
Driven Gear
Bigger Gear
Smaller Gear
Driver Gear
What do we call the gear connected to the output, such as a wheel or mechanism in a system?
Driver Gear
Driven Gear
Bigger Gear
Smaller Gear
When you have a system with a driver gear that is _______ than the driven gear you will increase torque and decrease speed.
smaller
bigger
same size
thicker
The __________ Gear causes motion
Driven
Driver
Smallest
Biggest
What is the gear ratio with a driver gear with 40 teeth and a driven gear with 8 teeth?
5
1/5
5/8
8/5
What is the Gear Ratio of a driven gear with 8 teeth and a driver gear with 32 teeth?
4
1/4
0.4
0.25
True or False: Two meshed gears always rotate in opposite directions
True
False
The most common gear is the _____ gear with straight teeth, mounted parallel
bevel
worm
spur
idler
Which of the following items do not have gears?
A non-digital Clock
A lift
An axe
Wind-up toys
A _______ is a wheel with teeth that meshes with another similar gear that is typically larger or smaller.
gear
tyre
pulley
rack and opinion
When you have a system with a driver gear (input) that is _______ than the driven gear (output) you will increase torque and decrease speed.
smaller
bigger
same size
thicker
If Gear A (20 teeth) was your driver and Gear B (80 teeth) was your driven. This would be a...
parallel gear
reducing gear
multiply gear
What is the purpose of a bike chain?
Helps with breaks on a mountain bike
Helps move the gears
Transfer energy from pedals to front wheels.
Transfer force from pedals to back gears which rotates the axle.
