📓 Simple Machines: Levers, pulleys, wheels, and axles

Simple Machines
Simple machines are devices that make work easier by changing the direction or amount of force needed.

1. Levers
- Definition: A lever is a bar or beam that pivots around a fixed point called the fulcrum.
- Types: First-class levers, second-class levers, third-class levers
- Examples: Crowbar, scissors, seesaw
- Advantage: Levers can change the direction of force or multiply the force.

2. Pulleys
- Definition: A pulley is a wheel with a grooved rim that changes the direction of force.
- Types: Single pulley, double pulley
- Examples: Elevators, window blinds, sailboats
- Advantage: Pulleys can change the direction of force or reduce the effort needed.

3. Wheels and Axles
- Definition: A wheel and axle is a machine that reduces friction and makes it easier to move objects.
- Types: Single wheel, multiple wheels
- Examples: Cars, bicycles, shopping carts
- Advantage: Wheels and axles reduce friction and make it easier to move heavy loads.

4. Inclined Planes
- Definition: An inclined plane is a surface that is tilted at an angle.
- Examples: Ramps, stairs, inclined roads
- Advantage: Inclined planes can reduce the effort needed to lift or move objects.

Examples and Applications
- Levers: Crowbars, scissors, seesaws
- Pulleys: Elevators, window blinds, sailboats
- Wheels and Axles: Cars, bicycles, shopping carts
- Inclined Planes: Ramps, stairs, inclined roads

Fun Activities
- Simple Machine Models: Build models of simple machines using everyday materials.
- Machine Scavenger Hunt: Find examples of simple machines in daily life.
- Design a Machine: Design and build a simple machine to solve a real-life problem.