Explains the science of how wheels and cranks work, discussing real-life examples such as car wheels, bicycle wheels, and crank handles, and includes activities that illustrate the principles covered.
Explains the science of how springs work, discussing real-life examples such as pogo sticks, locks, spring balances, and pinballs, and includes activities that illustrate the principles covered.
Explains the science of how pulleys and gears work, discussing real-life examples such as cranes, drive belts, drills, and mountain bikes, and includes activities that illustrate the principles covered.
Explains in basic terms the physical principles behind the use and operation of wheels and gears, with diagrams that provide several examples involving doorknobs, steering wheels, and pulleys.
Explains that screws are simple machines; describes their functions, including gripping, squeezing, connecting, and moving; and includes two hands-on activities.
Explains in basic terms the physical principles behind levers and shows with diagrams how several examples work, including wrenches, pliers, bolt cutters, and levers in machines such as tractors and bicycles.
