Conclusion: Use your data to answer your experimental question. The results indicate that when you drop water on a penny that the heads side of the penny will hold more drops (heads 23 drops, tails 18 drops).

What is the point of the penny lab?

The purpose of this Penny Lab is to determine how soap on a penny affects the number of drops that it can hold, compared with a penny with no soap. Water molecules are attracted to each other, so they tend to try to stick together (cohesion).

Why does a penny hold more water than soapy water?

You should find that plain tap water produces a much larger, stable drop of water on top of the penny than the soapy water does. This is because plain tap water has higher surface tension, so the surface is “stronger” and can hold together a larger drop.

How many drops can fit on a penny lab answers?

PENNY EXPERIMENT SET UP STEP 2: Use an eyedropper or pipette to pick up and carefully drip one drop of water at a time onto the penny. STEP 3: Count how many drops you can fit onto one penny until the water overflows. We were able to get ours up to about 27!

How many coins can you add without causing the water to overflow?

How many coins can we add to the water without the glass overflowing? Gently add coins one by one. Because of surface tension, the water will rise above the rim of the glass before it spills (just like the initial experiment).

Why didn’t the penny got stuck in the card as you performed the activity?

The coin has inertia, meaning it really wants to stay in one place. If you move the card slowly, it isn’t fast enough to overcome that force. If you flick it quickly, the coin stays in one place and then drops into the cup. An object at rest will remain at rest.

How does the coin drop experiment work?

When you flick the card out from under the penny, you allow gravity (an outside force) to act on it and drop it into the glass. The bottom of the glass stops the penny from falling. If you flick the card correctly, it simply slides out from between the glass and the penny.

Why does water not fall off a penny?

The cohesive force that occurs between water molecules is so strong that, at the water’s surface, it creates a “skin”, which is known as surface tension. As drops of water are added onto a penny, the adhesive force between the water and the penny keeps the water from falling off.

Why does water bubble on a penny?

Water’s cohesion and surface tension are special because of hydrogen bonds. The cohesion and surface tension of water becomes apparent when the drops of water you add to the penny reach the penny’s edge. Once the water has reached the edge, you begin to see a bubble or dome of water forming on top of the penny.

How does water stay on a penny?

The attraction of water molecules to other substances, like soil or glass, is called adhesion. As drops of water are added onto a penny, the adhesive force between the water and the penny keeps the water from falling off.

Why were many trials taken and averaged?

Many trials were taken and averaged in case the sizes of the water droplets varied in someof the trials. This provided for a more accurate average for both tap water droplets and soapy water droplets.

Why does water stay in a glass when it is upside down?

When you first turn the cup upside down, the pressure of the air inside the cup and the air pressure outside the cup are equal. The pressure of the air outside the cup is now greater than the pressure inside the cup and the card stays in place.

How do you predict the amount of water on a penny?

1) Make a prediction (just a guess since we have no data at this point) about how many drops of water will fit on the surface of a penny before it spills over. 2) Perform some “pilot experiments”. Remember that your results should be repeatable. Do everything exactly the same way at least 3 times.

What do you use to clean a Dirty Penny?

Clean a Dirty Penny Science Experiment Students love to collect and bring in a dirty penny for this science experiment. Students discover which cleaning solution works best to clean it and why using the scientific method! All you need are pennies, water, dish soap, salt, and vinegar.

What are the steps in making a scientific experiment?

Procedures: 1 Make a prediction (just a guess since we have no data at this point) about how many drops of water will fit on the surface of a penny before 2 Perform some “pilot experiments”. Remember that your results should be repeatable. 3 Suggest some of the factors that might be influencing the results.

Does the side of the Penny make a difference?

For example, my null hypothesis is that the side of the penny makes no difference. The alternate hypothesis is that the side of the penny does make a difference. H0: The number of water drops a penny can hold is not influenced by “side of penny”. HA: The number of water drops a penny can hold is influenced by “side of penny”.