WorksheetsMechanical Systems Quiz #1
Total questions: 27
Worksheet time: 21mins
Any device that helps us do work is called.
A producer
A machine
A blessing
A contraption
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
The formula for calculating the Mechanical Advantage is...
Output Force / Input force = MA
Input force / Output force = MA
Direction x Angle = MA
Angle x Speed = MA
A bar that is free to rotate about a fixed point.
Fulcrum
Lever
Effort load
Mechanism
A wheelbarrow is an example of what simple machine?
Class 1 lever
Class 2 lever
Winch
Inclined Plane
In the lever above, the Effort Force is applied in the middle. This makes it a ...
Class 3 lever
Class 1 lever
Class 2 lever
Class 4 lever
Gears are used in combination, with the teeth of the gears interlocking, so when one moves the other moves as well. Effort can be applied to the first gear (24 teeth), with the resulting effect on the second gear (12 teeth) being a ...
speed advantage of 0.5
speed advantage of 2
force advantage of 0.5
force advantage of 2
When gears are used in a gear train, the resulting effect is that each gear travels...
slower than the one next to it
faster than the one next to it
always in the same direction as the one next to it
in an opposite direction than the one it is nearest to
If the load is 100kg and the effort required to move it is 25kg, what is the mechanical advantage of the block and tackle pictured?
0.25
2500
4
not enough information given
A pulley system lifts a 100N load with a force of 20N. The input distance is 3m and the output distance is 0.5m. The efficiency of this pulley system is ...
(HINT: calculate the WORK output and input first!)
62.5%
75.0%
83.3%
92.75%
Hydraulic systems use ________ to transfer force from one point to another.
Air
Liquid
Solid
Gas
Air is compressible and liquid is incompressible.
True
False
A machine with a mechanical advantage of less than 1:
multiplies the input force so the machine would be good to help move heavy objects.
does not multiply the force, but increases distance and speed.
does not affect distance or speed
A machine with a mechanical advantage equal to 1:
multiplies the input force so the machine would be good to help move heavy objects.
does not multiply the force, but increases distance and speed.
does not affect distance or speed
To increase the mechanical 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
Jeff is a landscaping contractor and lifts a rock weighing 600 Newtons by wedging a board under the rock. Jeff weighs 150 Newtons and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?
0
2
4
0.25
What is the efficiency of the following simple machine?
85%
3%
33%
39%
Why can mechanical efficiency never be 100%?
No machine is strong enough.
Machines are too big to allow for 100% efficiency.
It can be 100%.
Some energy is lost in the form of heat/sound due to friction.
What do we call the gear connected to the input power source, such as a motor?
Driven Gear
Bigger Gear
Smaller Gear
Driving Gear
What do we call the gear connected to the output, such as a wheel or mechanism in a system?
Driving Gear
Driven Gear
Bigger Gear
Smaller Gear
work output
is the work done by the machine on the object
how the machine affects the speed of the job being done
Within a machine are groups of parts that perform specific functions, such as braking or steering
a pair of wheels that have teeth that interlink. When they rotate together, one gear wheel transfers turning motion and force to the other
work input
the ratio of the output to the input of any system
is the work needed to use, or operate the machine
the rate of motion that an object changes position
a group of parts that work together to perform a function
transmission
a measure of the amount of force applied to a given area
are used to overcome the frictional force of the machine
energy is transferred from one place to another, and no energy is changed or converted
are used to overcome the frictional force of the machine
