Purchase a can of new tennis balls so each ball will begin the experiment with a similar bounce. Preheat the oven to 200 degrees. Mark one tennis ball with an "A" and place it in the freezer for 30 minutes. Mark one tennis ball with a "B" and place it on a kitchen counter for 30 minutes. Turn the preheated oven off. Mark the final tennis ball with a "C" and place it in the warmed oven for 30 minutes. Place a ladder on cement near an outdoor wall. Get a piece of sidewalk chalk and a partner. Gather the three tennis balls and have the partner quickly climb the ladder. Drop each tennis ball one by one from the top of the ladder. As the tennis balls bounce use the sidewalk chalk to mark the height each ball is able to bounce up to before falling back down. Use a tape measure to record how high each ball bounced. After bouncing each ball and recording the results five times repeat the test to reach a hypothesis.
Purchase a 25-watt light bulb and a 100-watt light bulb. Purchase scientific thermometers that measure high heat levels at a teacher supply store or online. Twist both bulbs into a lamp socket. Tape each thermometer to the wall equal distance away from their respective light bulb. Turn the lights on for 30 minutes. Read and record the temperatures on the thermometers to reach your hypothesis about wattage and heat from a light bulb.
Shop at several different grocery stores and purchase as many different types of popcorn as you can find. Record the popcorn brand names and prices. Make a hypothesis for which popcorn you expect to leave the least amount of kernels unpopped. Follow the recommended directions on each package to prepare the popcorn. If given a range of cooking times, for example 1:30 - 2:00, keep the times consistent for each package. Label one bowl for each package of popcorn with its brand name. Pour the popcorn into its bowl. Count and record the number of kernels that are left unpopped. Make a conclusion based on your results.
Purchase a fresh loaf of bread. Bake a loaf of bread. Take one slice from each loaf and place them on separate plates. Put the plates in a spot that you can be sure they will not be disturbed. Check back after one week to compare the results of mold growth. Take a photograph of the two bread slices. Write a descriptive paragraph about each bread slice. Check back after one more week to see if there are any differences in moldiness. Make a hypothesis based on the results of your research.