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Understanding Simple and Compound Machines: Motion and Efficiency in Design

Explore simple and compound machines, their types, functions, and the role of translational and rotational motion in machine efficiency and design. Learn to build prototypes and understand mechanical advantage and efficiency.

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SIMPLE AND COMPOUND MACHINES Applying Translational and Rotational Motion in Machine Design Prepared by: Ms. Rica Mae Caisip Subject: General Science 11 | SY 2026– 2027
Learning Objectives
Differentiate between simple and compound machines. Identify the six types of simple machines and their functions. Explain translational and rotational motion in operations. Describe characteristics of efficient mechanical systems. Design and build a prototype of an efficient machine. Recognize the importance of machines in productivity. Learning Objectives
ESSENTIAL QUESTION How do simple and compound machines make work easier and more efficient? “ • Machine Definition • Effort Reduction • Efficiency Factors
Question: What do these objects have in common? Hand Tools Precision cutting mechanisms. Bicycle Complex gear systems. Construction Crane Massive load distribution. Machines Around Us
Force & Direction Changer A machine is a device that makes work easier by changing the magnitude or direction of a force. Definition of a Machine
The Fundamentals A simple machine is a basic mechanical device with few or no moving parts that changes the direction or amount of force. It forms the core component of all larger mechanical systems. By manipulating distance and force, simple machines provide mechanical advantage to the user. "The simplest machines are the most powerful tools of civilization." What is a Simple Machine?
Machine Function Example Lever Multiplies force using a fulcrum Crowbar, Seesaw Wheel and Axle Reduces friction for rotational motion Bicycle Wheel Pulley Changes direction of force via a rope Flagpole Inclined Plane Reduces lifting force over a slope Ramp Wedge Splits or cuts materials apart Knife, Axe Screw Converts rotation into linear motion Bolt, Jar Lid The Six Simple Machines
Integration of Parts A compound machine consists of two or more simple machines working together to perform complex tasks. By combining mechanisms, these machines can execute sophisticated functions with high efficiency and precision. • Bicycle: Lever + Wheel/Axle + Pulley • Scissors: Two Levers + Two Wedges • Wheelbarrow: Lever + Wheel/Axle Compound Machines
Translational Motion Movement from one place to another in a straight or curved path. Examples: Elevator, Conveyor belt, sliding cart. Rotational Motion Movement around a fixed axis or center point. Examples: Fan blades, Gears, Spinning wheels. Translational and Rotational Motion
Machine Translational Component Rotational Component Bicycle Rider moves forward Wheels rotate around axle Crane Hook moves upward Cable drum/Pulley rotates Wheelbarrow Payload moves forward Single wheel rotates Drill Bit moves inward Drill bit spins at high speed Applying Motion in Machines
Calculation MA Output Force ÷ Input Force Force Multiplier Mechanical Advantage tells us how much a machine multiplies force. A higher mechanical advantage means: Less Effort: Less human force required. Easier Work: Tasks are simplified. Efficiency: Optimized resource usage. Mechanical Advantage (MA)
Performance Formula η (Workout / Workin) × 100% The 100% Barrier No machine is perfectly efficient due to energy losses. Factors causing loss include: Machine Efficiency
Low Friction Proper lubrication and smooth surfaces reduce heat loss. Alignment Correct mechanical alignment ensures force is directed properly. Durability Strong materials prevent energy loss through deformation. Characteristics of Efficient Machines
Escalator Fishing Rod Hand Drill Everyday Applications
Design Challenge Build a Prototype Design a machine using recycled materials that solves an everyday problem. Evaluation Criteria: • Creativity (20%) • Motion Concepts (25%) • Functionality (30%) • Efficiency (15%)
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