5 Repeat the experiment with a second science book stacked on top of the first one. Record your results. Predict how many weights you will need to move three books. Repeat the experiment to find out how many weights are needed. Record your answer.
Cars have dozens and dozens of wheels.
Remember that rollers, gears, and pulleys are all types of wheels. Find at least five different types of wheels in or on your car. Return to the top of the page. Put the load as close as possible to the end of the lever. Be careful that the fulcrum stays in place.