P079 - Inseparable books P164 - Exploring levers P176 - Observing how pulleys affect lifting a load P177 - Measuring how pulleys affect lifting a load P189 - Water Resistance P130 - How does the size of a 'cupcake' parachute affect drop time? P206 - Turning a figure with and without gears P213 - Using a bicycle to demonstrate why we use gears P178 - Measuring friction on different surfaces