1. The Red Group’s Week

2. Wheel and Axle A wheel and axle is a simple machine made of two circular and cylindrical objects fastened together that rotate about a common axis. A doorknob and a car’s steering wheel are examples of wheel and axle. The mechanical advantage of a wheel and axle is found by dividing the radius of of the wheel by the radius of the axle.

3. A wheel and axle is a simple machine. Simple machines make work easier. A wheel and axle has a lever that moves around an axle in a circle. A doorknob and a car’s steering wheel are examples of wheel and axle. The mechanical advantage of a wheel and axle is found by dividing the radius of of the wheel by the radius of the axle.

4. Pulley A pulley is a simple machine made of a ridged wheel with a rope wrapped around it. When pulled on one end of the pulley that creates the input force. The other end of the pulley is the output force. For example a flagpole is pulled down and the flag moves up. The ideal mechanical advantage of a pulley is equal to the number of sections of rope that support the object.

5. Fixed Pulley “A fixed pulley does not change the amount of force applied. It does not change the direction of the force.” Science Explorer Motion, Forces and Energy

6. Movable Pulley “A movable pulley decreases the amount and input force needed. It does not change the direction of the force.” Science Explorer Motion, Forces and Energy

7. Block and Tackle “A block and tackle is a pulley system made of fixed and movable pulleys.” Science Explorer Motion, Forces and Energy