dxu46 wrote:Bob wonders how being in a swimming pool for an extended amount of time affects body weight. He decides to test this experiment using IV levels of 20 minutes, 40 minutes, and 1 hour.
a. Write a hypothesis for this experiment.
b. List materials and write a condensed procedure for this experiment.
c. Identify and explain one possible experimental error in this experiment.
a. Being in a swimming pool for a longer period of time causes a greater decrease in body weight because the chlorinated water causes osmosis through the skin.
b. Materials: 3 humans, 1 complete swimming pool system, 3 bathing suits, scale
Procedure:
1. On Day 1, have human A put on his bathing suit and weigh him. Record the weight.
2. Have him sit in the pool for 20 minutes.
3. After twenty minutes, call him out and weigh him again. Record the weight.
4. Calculate the difference between the weights recorded in #1 and #3 and record it.
5. Wait for the water to cycle through.
6. Repeat 1-5 for humans B and C.
7. On Day 2, repeat 1-6 for a forty-minute interval.
8. On Day 3, repeat 1-6 for a 1-hour interval.
c. One possible experimental error could be behavior overnight. Although this interval is necessary to have the subjects return to their natural weight, their behaviors could differ significantly on Night 1 versus Night 2.
dxu46 wrote:Bob wonders how being in a swimming pool for an extended amount of time affects body weight. He decides to test this experiment using IV levels of 20 minutes, 40 minutes, and 1 hour.
a. Write a hypothesis for this experiment.
b. List materials and write a condensed procedure for this experiment.
c. Identify and explain one possible experimental error in this experiment.
a. Being in a swimming pool for a longer period of time causes a greater decrease in body weight because the chlorinated water causes osmosis through the skin.
b. Materials: 3 humans, 1 complete swimming pool system, 3 bathing suits, scale
Procedure:
1. On Day 1, have human A put on his bathing suit and weigh him. Record the weight.
2. Have him sit in the pool for 20 minutes.
3. After twenty minutes, call him out and weigh him again. Record the weight.
4. Calculate the difference between the weights recorded in #1 and #3 and record it.
5. Wait for the water to cycle through.
6. Repeat 1-5 for humans B and C.
7. On Day 2, repeat 1-6 for a forty-minute interval.
8. On Day 3, repeat 1-6 for a 1-hour interval.
c. One possible experimental error could be behavior overnight. Although this interval is necessary to have the subjects return to their natural weight, their behaviors could differ significantly on Night 1 versus Night 2.
a. Technically, it's correct, but I'd prefer it to be in the form of If...then...because... but cause-effect works I guess.
b. Procedure: You forgot to include "Record data etc."
c. That's fine, although you forgot to include type of error.
Jacobi wrote:Design an experiment on the topic: projectile motion. Use these materials: 3 marbles of different weights, stopwatch, ruler, table.
SoP: How does weight affect projectile motion?
Hypothesis: If marbles of different weights are rolled down a ruler ramp, then they will travel farther the heavier their weights are because of Newton's 2nd law - F = M x A.
That satisfies the question?
Jacobi wrote:Design an experiment on the topic: projectile motion. Use these materials: 3 marbles of different weights, stopwatch, ruler, table.
SoP: How does weight affect projectile motion?
Hypothesis: If marbles of different weights are rolled down a ruler ramp, then they will travel farther the heavier their weights are because of Newton's 2nd law - F = M x A.
That satisfies the question?
Wait what do ramps have to do with projectile motion? Projectiles are only affected by gravity (and to a lesser extent, air resistance).
Jacobi wrote:Design an experiment on the topic: projectile motion. Use these materials: 3 marbles of different weights, stopwatch, ruler, table.
SoP: How does weight affect projectile motion?
Hypothesis: If marbles of different weights are rolled down a ruler ramp, then they will travel farther the heavier their weights are because of Newton's 2nd law - F = M x A.
That satisfies the question?
Wait what do ramps have to do with projectile motion? Projectiles are only affected by gravity (and to a lesser extent, air resistance).
Yes, the marble would've rolled off the table, exhibiting projectile motion, though I would've measured the distance traveled because it is influenced by the original projectile motion.
SoP: How does weight affect projectile motion?
Hypothesis: If marbles of different weights are rolled down a ruler ramp, then they will travel farther the heavier their weights are because of Newton's 2nd law - F = M x A.
That satisfies the question?
Wait what do ramps have to do with projectile motion? Projectiles are only affected by gravity (and to a lesser extent, air resistance).
Yes, the marble would've rolled off the table, exhibiting projectile motion, though I would've measured the distance traveled because it is influenced by the original projectile motion.
That's not what I was thinking of, but it is a perfectly reasonable experiment on the more general topic of "motion". Projectile motion is under the influence of gravity only. The normal forces and friction of the ruler are other forces acting.
UTF-8 U+6211 U+662F wrote:
Wait what do ramps have to do with projectile motion? Projectiles are only affected by gravity (and to a lesser extent, air resistance).
Yes, the marble would've rolled off the table, exhibiting projectile motion, though I would've measured the distance traveled because it is influenced by the original projectile motion.
That's not what I was thinking of, but it is a perfectly reasonable experiment on the more general topic of "motion". Projectile motion is under the influence of gravity only. The normal forces and friction of the ruler are other forces acting.
What would your experiment have been? I usually only do the write-up portion.
dxu46 wrote:
Yes, the marble would've rolled off the table, exhibiting projectile motion, though I would've measured the distance traveled because it is influenced by the original projectile motion.
That's not what I was thinking of, but it is a perfectly reasonable experiment on the more general topic of "motion". Projectile motion is under the influence of gravity only. The normal forces and friction of the ruler are other forces acting.
What would your experiment have been? I usually only do the write-up portion.
I would have talked about dropping the marbles from a fixed height (use the ruler), and show that they land in the same amount of time.
Jacobi wrote:
That's not what I was thinking of, but it is a perfectly reasonable experiment on the more general topic of "motion". Projectile motion is under the influence of gravity only. The normal forces and friction of the ruler are other forces acting.
What would your experiment have been? I usually only do the write-up portion.
I would have talked about dropping the marbles from a fixed height (use the ruler), and show that they land in the same amount of time.
Doesn't projectile motion involve a curve? Otherwise, wouldn't it be linear motion?
