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WorksheetsSci 8 Unit D 1.0 Simple & Complex Machines
Total questions: 92
Worksheet time: 2hrs 25mins
3. Which type of lever is this?
First Class Lever
Second Class Lever
Third Class Lever
The place where a lever pivots is called the _______.
Point
Triangle
Fulcrum
Effort
Type of lever shown in the diagram:
Class One
Class Two
Class Three
What type of lever is this?
First Class Lever
Second Class Lever
Third Class Lever
Which type of lever is shown in this image?
First Class Lever
Second Class Lever
Third Class Lever
Effort Force
1st Class
2nd Class
3rd Class
It is not a lever
Which simple machine is shown in the picture?
pulley
lever
wheel and axle
screw
If the fulcrum is closer to the load, it will take
more force to lift the load
less force to lift the load
equal force to the lift the load
more speed to lift the load
An example of a second class lever is shown in which picture?
The tennis raquet is
class 3 lever
class 2 lever
class 1 lever
Simple machines like a class 2 lever, ramp, wedge do which of the following?
Reduce the mass of an object that needs to be moved
Reduce the distance an object needs to be moved
Reduce the amount of time needed to move an object over a distance
Reduce the force needed to move an object over a distance
What type of simple machines are in the shovel?
Lever and wedge
Inclined Plane and lever
Pulley and wedge
Lever and screw
What type of simple machine does the photo show?
Lever
Inclined plane
Wedge
Screw
When using an inclined plane that has a rough surface, there is a disadvantage:
a shorter ramp is needed
friction increases the effort force needed
the inclined plane must be shorter
increases speed
Effort ...
can only be a pushing force
is a unit used for measuring force
is how far an object moves in a certain amount of time
is the force applied to a simple machine
What do you call a machine made up of two or more simple machines?
combination or comprehensive machine
compound or complex machine
comprehensive or constructive machine
constructive or group
machine
How can you decrease the effort force needed to push an object to the top of the ramp?
cover the surface with carpet
increase the length of the ramp
increase the height of the ramp
decrease the length of the ramp
What is the effect of the pulley shown in the picture?
changes the direction of the force
greatly increases the amount of effort force
greatly decreases the amount of effort force
allows you to pull the rope a longer distance
What type of simple machines are in this device?
wheel & axle and screw
wedge and inclined plane
inclined plane and wheel & axle
wheel & axle and wedge
How does a lever make lifting objects easier?
The amount of effort force needed is doubled
the amount of effort force needed is increased
the amount of effort force needed is reduced
the amount of effort force needed stays the same
Where should the fulcrum be placed in order for the student to use the least amount of effort possible to lift the load?
point A
point B
point C
The object must be moved a greater distance up the inclined plane.
It takes less effort to move the object up the inclined plane.
The inclined plane must be made of wood.
The inclined plane must be short.
An example of a complex machine is...
stapler
ramp
broom
screw top lid
If the small gear is driving, the gear system is ...
reducing
multiplying
When a driving gear is larger than a driven gear the output is.....
Faster Speed
Slower Speed
Reducing
When a driving gear is smaller than the driven gear then the gear train is
multiplying
reducing
faster speed
WHAT IS THIS?
chain linkage
transmission
screw
wheel and axle
An advantage of using a chain linkage instead of a belt is ...
flexibility
less slippage
lightweight
can move more easily
The picture shows ...
a belt
a transmission
a chain
a pulley
Which of the following uses an inclined plane to meet the human need for water?
Archimedes screw
mill wheel
sakia
aqueduct
(SIA pg.259) The mill wheel ...
is moved by water
moves water
In the metric system of measurement, force is measured in which unit?
Joules
Pounds
Newtons
Grams
A second class lever gives a greater force advantage than a third class lever for lifting a large load.
true
false
Which is not an effect of a simple machine?
change the direction of a force
increase speed
multiply force
reduce the mass
What simple machine is shown?
wheel and axle
pulley
screw
wheel
What type of gear system is shown in the diagram?
reducing
multiplying
An advantage of using a belt linkage:
less slipping off
won't rust
unlikely to break apart
A disadvantage of a lever to lift a load:
you must move with the load over a greater distance
you must pull a farther distance than the load
can only be used in one direction
you must move a greater distance than the load
A disadvantage of an inclined plane:
you must move with the load over a greater distance
you must pull a farther distance than the load
can only be used in one direction
you must move a greater distance than the load
A disadvantage of a wedge:
you must move with the load over a greater distance
you must turn a farther distance than the load moves
can only be used in one direction
you must move a greater distance than the load
This device measures
length
distance
force
mass
A machine is a device that reduces the amount of work.
The common function of the levers in the picture:
increase speed
reduce effort force
transfer force
reduce the load mass
This digram shows
the systems of a subsystem
the subsystems of a system
The diagram shows
Class 1 lever
Class 2 Lever
Class 3 Lever
The image shows a
chain linkage
belt linkage
Chain linkages have an advantage:
lightweight
less rusting
less slipping
flexible
Which is a component on an airplane?
pilot
wheels
metal
size
If gear 1 turns clockwise, which gear also turns clockwise?
2
3
4
In the gear train shown in the picture, the input gear is the driving gear.
This gear train is used for
increasing speed
decreasing speed
If Gear 1 is the driver, then the gears in the diagram are used to
lift a heavy load
make the load move faster
Which of these class one levers would lift the load with the least effort force?
A
B
C
What is the effect of the lacrosse stick shown in the picture?
changes the direction of the force
reduces the amount of effort force
increases the speed of the load
transfers the force
What type of gear train?
muliplying
reducing
For every one turn of the driver gear, the driven gear turns ____ times?
2
3
4
5
For every one turn of the driver gear, the driven gear turns ____ times?
2
3
4
5
For every one turn of the driven gear, the driver gear turns ____ times?
2
3
4
5
The 6 simple machines are...
Lever, nail, screw, pulley, wedge, wheel & axle
Hammer, inclined plane, screw, pulley, nail, wheel & axle
Lever, inclined plane, screw, pulley, wedge, wheel & axle
Inclined plane, diamond, pulley, wedge, metal, wheel & axle
A system is a group of parts that work together to perform a function.
True
False
Identify the simple machine in the picture.
Lever
Inclined plane
Wheel and axle
Screw
Identify the simple machine in the picture.
Wheel and axle
Inclined plane
Screw
Pulley
Compound machines consist of two or more simple machines combined together to make work easier and increase the mechanical advantage. What three simple machines are used in a can opener?
Wedge , wheel/ axle, and inclined plane.
Wedge, lever, and wheel/ axle.
Inclined plane, screw, and wheel/ axle.
Pulley, wheel/axle, and wedge.
Disadvantage: You must turn a greater distance to lift a heavy load.
pulley
inclined plane
wedge
wheel & axle
Disadvantage: Can only be used in one direction - cannot be used upside-down.
Screw
Lever
Wedge
Wheel & Axle
Inclined Plane
Which class lever?
Class 1
Class 2
Class 3
A disadvantage of a wheel and axle is
you must exert a force over a greater distance than the load
you must move the load over a greater distance
it can only be used in one direction
you must turn a greater distance to get more force
A disadvantage of a wedge is
you must exert a force over a greater distance than the load
you must move the load over a greater distance
it can only be used in one direction
you must turn a greater distance to get more force
A disadvantage of a lever is
you must exert a force over a greater distance than the load
you must move the load over a greater distance
it can only be used in one direction
you must turn a greater distance to get more force
Gears that increase the speed of rotation in a device are called
driving gears
driven gears
reducing gears
multiplying gears
In a gear train, the gear that applies a force to the other gear is called the
driving gear
driven gear
reducing gear
multiplying gear
In order to increase the speed in a gear system
the driving gear must be smaller than the driven gear
the driving gear must be larger than the driven gear
the driving gear must be the same size as the driven gear
none of these
An example of a system is
stapler
lever
spring
handle
An example of a subsystem is
stapler
watch
spray bottle
handle
Input and output forces are measured in...
Grams
Pounds
Newtons
Joules
In the gear train in the picture, the speed will
increase
be constant
decrease
A simple machine reduces the amount of work needed to accomplish a task.
true
false
What is the Gear Ratio of a driven gear with 8 teeth and a driver gear with 32 teeth?
4:1
3:1
2:1
5:1
What is the gear ratio with a driver gear with 40 teeth and a driven gear with 8 teeth?
5:1
4:1
3:1
2:1
If Gear A (20 teeth) is the input and Gear B (80 teeth) wis the output, then this gear train 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.
Example of a system:
pedal
stapler
stairs
steering wheel
