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Understanding Simple and Compound Machines: Motion and Efficiency in Machine Design

Explore translational and rotational motion, simple and compound machines, and design efficient machine prototypes minimizing friction and energy loss.

Science◦
SIMPLE COMPoUND machi an d GRADE 11 SCIENCE
Learning Objectives: By the end of the lesson, learners will be able to: Apply concepts of translational and rotational motion in machine design. Explain how simple and compound machines work. Identify characteristics of efficient machines. Design ideas for efficient machine prototypes.
Types of Motion Revie w! Translational Motion • Motion along a straight or curved path. • Every part of the object moves the same distance. • Example: Elevator moving up and down. Rotational Motion • Motion around an axis. • Different parts move through different distances. • Example: Bicycle wheel spinning.
Can a machine use both types of motion at the same time? Questi on
Simple Machines Lever Pulley Wedge A rigid bar that pivots around a fixed point (fulcrum) to move or lift objects. Example: Seesaw, crowbar A grooved wheel with a rope or cable used to lift or move loads. Example: Flagpole, construction crane Two inclined planes joined together to split, cut, or hold objects. Example: Knife, axe
Simple Machines A slanted surface used to raise or lower objects with less force. Example: Ramp, staircase An inclined plane wrapped around a cylinder that converts rotational motion into linear motion. Example: Jar lid, bolt A large wheel attached to a smaller axle that rotates together to make work easier. Example: Doorknob, bicycle wheel INCLINED PLANE Screw WHEEL AND AXLE
A compound machine is a machine that consists of more than one simple machine. Compound Machines A wheelbarrow is a compound machine because it combines two simple machines that work together: • Lever – The handles and tray act as a second-class lever to lift and carry loads. • Wheel and Axle – The front wheel reduces friction and makes moving heavy loads easier.
• Choose a compound machine. • Explain how translational and rotational motion work together to make the machine efficient. Think and Discuss
What Makes a Machine Efficient? An efficient machine: • Minimizes friction • Reduces energy loss • Uses appropriate materials • Transfers motion effectively • Requires less input force Efficiency Formula: Efficiency = Energy Output _______________ Energy Input x 100 Higher efficiency means less wasted energy.
Design Challenge Performance Task: Task: In groups, design a prototype of a simple or compound machine that uses both translational and rotational motion. Include: • Sketch of the machine • Motion involved • Purpose of the machine • Features that improve efficiency