Break students up into groups of three. Ask them to create a chart with three columns and four rows. Each row should list an ingredient: water, shampoo, fruit juice and honey. Each column should represent a test.
Give each group four cylinders and have them fill the cylinders three quarters of the way up with each liquid listed on their charts. Make sure each cylinder is filled with the same amount of liquid. Place them in a row.
Give each team member a job: the tester, the timer and the recorder. Give the timer a stop watch and the tester four marbles of the same size. When the timer starts the count, the tester should drop the marble into the first liquid. As soon as the marble reaches the bottom of the container, the timer should stop. The recorder should recorder how long it took for the marble to reach the bottom.
Test each liquid the same as the first and record the data. Once the first test is completed, fish out the marbles, refill the liquids (if needed) and conduct the experiment again. Three separate tests should give the students an idea of how resistant the liquid is to flow.
Compare the notes from all of the groups and decide as a class which liquids have high viscosity and which liquids have low viscosity. If time permits, consider heating the liquids a few degrees using a microwave and a thermometer and re-test. The class will see how temperature affects the viscosity of liquids.