What is a dependent variable in a penny experiment?
The independent variable in this experiment was the side of the penny. #2. The dependent variable in this experiment was the number of drops on a penny.
How many drops of water can fit on a penny lab report?
It’s just amazing to watch the drops of water pile up on the penny! We tried this several times, and we were able to get 23-27 drops on the penny each time before the water ran off the side. Then we compared the surface tension of plain water with soapy water.
Which of the following is the dependent variable in the surface tension experiment?
So, surface tension is the dependent variable.
Which side of a penny will hold more drops of water choose the best hypothesis?
Which side of a penny will hold more drops of water? Choose the best hypothesis. If I use the heads side of a penny, then it will hold more drops of water than tails because it has less detail on it. Tails will hold more drops of water.
How many drops of oil can fit on a penny?
To help ensure the best results, we used a clean penny each time. Our results were interesting. I knew that the oil should have less surface tension than the water, but we had equal results – 23 drops for each.
What is the independent variable in surface tension?
The independent variable is the addition of soap. An independent variable is one that is changed or controlled in an experiment. This is the independent variable because the soap was added to the water, changing the composition and surface tension of the water.
What is the scientific explanation for how we are able to see the coins?
It demonstrates a special property of water, called light refraction. If you put a coin inside a glass of water, you will be able to see that it appears in two places at once. It’s as if a mirror were used to show the coin to both the front and the back of its surface at the same time.
What is the independent variable in an experiment?
Answer: An independent variable is exactly what it sounds like. It is a variable that stands alone and isn’t changed by the other variables you are trying to measure. For example, someone’s age might be an independent variable.
What is the independent variable in the pepper and water experiment?
Independent Variable(IV)- Dish Detergent, Dependent Variable(DV)- Whether or not the surface tension allows for the pepper to float, Controlled Variable(CV)- Water. First I filled a bowl with half a cup of water(CV) and sprinkled black pepper over it. I then observed the black pepper floating on top of the water.
How many drops of water will fit on a penny before it spills over the side?
Were you surprised to discover that a lot more drops of water fit on a penny than you predicted? We had 27 drops of water on ours! Surface tension and cohesion is the reason you can get so many drops of water on a penny. Cohesion is the “stickiness” of like molecules to one another.
Can a penny hold more drops of plain water or 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.
Why does a penny hold more drops of water than alcohol?
Alcohol molecules can meet at areas where they would not attract as strongly. The water is more attracted to itself than to the metal of the penny. The alcohol is a bit less attracted to itself so it spreads more on the penny.
Why can a penny hold so many drops of water?
Gravity flattens the droplets, cohesion holds the droplets together, and adhesion holds the drops on the surface of the coin. The cohesive force is the pull of the water molecules on themselves. Each successive drop sticks to the water that’s already on the coin. We often call this cohesive force “surface tension”.
When we drop a coin into the water it?
What is this? This bending of light, called refraction, causes the apparent position of the coin to change to a shallower position1 (see diagram). The light bends when it passes from water to air on top of the water. It does the same thing when it passes through the glass, making the coin appear to be closer to you.
How do I find the independent variable?
The easiest way to identify which variable in your experiment is the Independent Variable (IV) and which one is the Dependent Variable (DV) is by putting both the variables in the sentence below in a way that makes sense. “The IV causes a change in the DV.
What is an independent variable example?
It is a variable that stands alone and isn’t changed by the other variables you are trying to measure. For example, someone’s age might be an independent variable. Other factors (such as what they eat, how much they go to school, how much television they watch) aren’t going to change a person’s age.
What is dependent variable in pepper and soap experiment?
Is water an independent variable?
In this case, the amount of water is the independent variable because that is what you’re changing in the experiment: one seed gets a lot of water and the other seed only gets a little water.
What is the independent variable for the drops on a penny experiment?
The independent variable for the Drops on a Penny lab experiment is the type of solution used for the experiment. The independent variable is the portion of the experiment that is changed between tests. For the Drops on a Penny lab experiment,…
What is the purpose of the Penny experiment?
The purpose of the experiment is to test the cohesion and surface tension properties of the penny and solution. Testers can hypothesize as to which solution works best on the surface of the penny and then repeat the experiment with different solutions to view the results.
How do you write a water drop on a penny?
Scientific Method: Water Drops on a Penny Abstract (Extra Credit): (Final Lab Report) The abstract is a short paragraph summarizing purpose, problem examined, results, and outcomes of the lab. This will come at the front of the lab, but should be the last thing written.