B3

All the simple machine are alike and different. They are alike because they all use mechanical advantage. Also they all can change direction, speed, and force but they cannot change work. The thing that makes them different is their design. They all have many different shapes. The Wheel and Axle is a circular object with a center post. A pulley is a grooved wheel with a rope in the groove. A lever is straight object pivoting side to side on a fulcrum. The screw is a inclined plane wrapped around around a cylinder. The inclined plane is a flat piece at an angle. Finally the wedge is a double inclined plane that moves. In conclusion this is why the six different simple machines are similar and different.