Apply Motion Concepts– Use translational and
rotational motion principles in machine design.
Build Prototypes – Construct working models
of simple and compound machines.
Explain Efficient Machines – Describe
characteristics that make machines work
effectively.
Hands-On Activities – Participate in interactive
experiments and building exercises.
Design Challenges – Create innovative
solutions using mechanical advantage
principles.
3.
What are
Simple
Machines
?
Simple machinesare
basic mechanical
devices that change
the magnitude or
direction of force to
make work easier.
Here's why they are
fundamental...
4.
What is
a Lever?
Alever is a rigid bar that
pivots on a fixed point called a
fulcrum to multiply force or
change its direction.
There are three classes based
on fulcrum, load, and effort
positions:
• Class 1: Fulcrum between
effort and load (seesaw)
• Class 2: Load between
fulcrum and effort
(wheelbarrow)
• Class 3: Effort between
fulcrum and load (tweezers)
5.
The Wheel
and Axle
Awheel and axle consists of
a wheel attached to a
smaller axle, both rotating
together as a single unit.
Mechanical advantage
comes from the radius ratio
—a larger wheel radius
means less effort needed to
turn the axle.
Examples include door
knobs, rolling cart wheels,
and steering wheels.
6.
What are
Pulleys?
A pulleyis a grooved
wheel with a rope or
cable that changes force
direction and can
multiply force.
• Fixed pulley: changes
direction only
• Movable pulley:
multiplies force
• Compound pulley:
combines both benefits
7.
Inclined Plane,
Wedge &Screw
Inclined Plane: sloped surface reduces force
needed
Wedge: two inclined planes that split materials
Screw: converts rotational to linear motion
8.
Translationa
l
Motion in
Simple
Machines
Objects movelinearly along
a straight path—up a slope,
across a surface, or through
a material.
Work Input = Work Output
(ideal):
Force × Distance remains
constant
Examples: pushing a box up
a ramp, splitting wood with
a wedge
9.
Rotationa
l Motion
in Simple
Machines
Rotationalmotion involves
torque and angular
displacement:
• Lever rotates around
fulcrum; torque = force ×
distance from pivot
• Wheel and axle gain
mechanical advantage from
radius ratio
• Pulley wheels change force
direction through rotation
• Screws convert rotational to
linear motion
Mechanical Advantage –The ratio of load to effort force;
higher MA means less effort needed to move heavy loads.
Force Multiplication – Trade-off between force and distance;
gaining mechanical advantage requires moving effort over
greater distance.
Torque Optimization – Maximize rotational efficiency by
adjusting lever arm length and force application angle.
Material Choice – Select materials balancing strength,
weight, and durability for optimal machine performance.
Safety Considerations – Design with stability, load limits,
and fail-safes to prevent accidents and equipment failure.
12.
Prototype Design
Process
Identify Problemor Task
1
2 Research Existing
Machines
3 Brainstorm & Sketch
Designs
4 Select Best Design
5 Build Your Prototype
6 Test Performance
Iterate & Improve
7
8 Document Process
13.
Lever Systems –Build a catapult to launch
objects or a seesaw to explore balance and
fulcrum positions.
Pulley Systems – Construct fixed, movable, or
compound pulley setups to lift weights with
reduced effort.
Inclined Plane – Design a ramp to move heavy
objects upward using less force over greater
distance.
Wheel and Axle – Create a simple cart or winch to
demonstrate rotational mechanical advantage.
Wedge and Screw – Build a splitting tool or screw
jack to convert force direction and motion type.
14.
Crane Model –Combines pulleys, levers, and
wheel and axle to lift heavy loads with
precision.
Mechanical Grabber – Uses interconnected
levers and linkages to grip and manipulate
objects.
Elevator Model – Pulley systems with
counterweights demonstrate balanced vertical
motion.
Bicycle Model – Integrates wheels, gears, and
lever-action brakes for efficient transportation.
Nutcracker – Two levers working together
multiply force to crack shells with minimal
effort.
15.
Design
Challenges
Challenge yourself! Builda machine to lift the
heaviest load with least effort, create a compound
machine using 3+ simple machines, design an
ergonomic tool, or optimize for highest efficiency!
16.
What Is
Machine
Efficiency?
Efficiency measureshow
well a machine converts
input work to useful output
work.
Efficiency = (Work Output /
Work Input) × 100%
Also: Efficiency = (AMA /
IMA) × 100%
Real machines always have
efficiency < 100% due to
friction, heat, and
deformation losses.
17.
High Mechanical Advantage– Choose appropriate
MA ratio for the task to maximize force
multiplication efficiently.
Minimal Friction – Use smooth surfaces, bearings,
and lubrication to reduce energy losses between
moving parts.
Optimal Material Properties – Select materials that
are strong, lightweight, and durable for maximum
performance.
Proper Design and Construction – Ensure precise
alignment, balanced components, and quality
assembly.
Reduced Energy Loss – Minimize heat, sound, and
vibration through streamlined design and tight
tolerances.
Lubricate Moving Parts– Apply oil or grease to reduce
friction between surfaces and minimize energy loss.
Use Low-Friction Materials – Choose smooth, durable
materials like nylon, Teflon, or polished metals for
contact surfaces.
Precision Manufacturing – Ensure accurate alignment
and tight tolerances to reduce wobble, vibration, and
wasted motion.
Regular Maintenance – Clean, inspect, and replace worn
parts to keep machines operating at peak efficiency.
Streamlined Design – Remove unnecessary components
and simplify mechanisms to reduce weight and energy
consumption.
20.
Construction – Cranesand excavators use
compound machines to lift heavy loads with
precision and efficiency.
Transportation – Bicycles and cars combine wheels,
axles, gears, and levers for efficient movement.
Manufacturing – Assembly lines and robotic arms
use coordinated machine systems to maximize
productivity.
Agriculture – Plows and harvesters apply
mechanical advantage to cultivate and collect crops
efficiently.
Medical Devices – Surgical tools and wheelchairs use
precise lever and wheel systems for life-saving
applications.
21.
Efficiency Analysis
Activities
Compare &Measure - Test different pulley systems'
efficiency and measure friction on inclined planes.
Calculate Efficiency - Measure work input and
output of your classroom-built machines using the
efficiency formula.
Design Improvements - Analyze your prototypes
and propose modifications to increase efficiency.
22.
Simple Machines ChangeForce – Basic devices that
alter the magnitude or direction of force to make
work easier.
Motion Concepts Underpin Operation – Translational
and rotational motion principles drive how all
machines function.
Mechanical Advantage is Key – The ratio of output
force to input force determines machine
effectiveness.
Compound Machines Combine Simple Ones –
Multiple simple machines work together for complex
tasks.
Efficiency Measures Useful Output – Real machines
have energy losses; good design minimizes friction
and waste.
23.
3-2-1
Reflection
3 ways motionconcepts helped your prototype
design...
2 factors that most affect machine efficiency...
1 way you can apply these principles in life or
careers...
24.
Next Steps &
ProjectIdeas
Continue refining your prototypes based on
efficiency data and testing results.
Explore advanced machine designs, new
materials, and emerging technologies.
Apply your concepts in science fairs,
competitions, or innovation challenges.
Collaborate on community problem-solving
projects using your machine design skills.
Check out resources for further reading and
experimentation in the science lab!
25.
Thank You &
Questions
Thankyou for your creativity and
hard work! We welcome your
questions, feedback, and are excited
to see you share your project results
with the class.
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