Bernoulli’s Principle
PURPOSE:
Explain some situations using Bernoulli's principle
MATERIALS:
Balloon
Hair Blower
Drinking Straw/Cup of Water
Beach Ball or Balloon/ Stand Fan
Strip of Paper
Hair Blower
Drinking Straw/Cup of Water
Beach Ball or Balloon/ Stand Fan
Strip of Paper
LEARNING STATION A: KISSING BALLS
Blow at the middle of the two hanging balloons. Observe what will happen.
Questions and Answers:
1. How did the two balloons react? Use an illustration.
Answer: As we blew in between the balloons, both of them moved closer together.
Questions and Answers:
1. How did the two balloons react? Use an illustration.
Answer: As we blew in between the balloons, both of them moved closer together.
2. At which side of the two balls is the velocity of air greater?
Answer: In between the balloons
3. What does the behavior of the two balloons suggest about the pressure between them and the pressure on either side.
Answer: As the velocity increases, the pressure decreases; As we blew in between the balloons, the velocity increases so the pressure increases. Since the outside of the balloon has greater pressure than in between them, it pushes the balloon into lower pressure which is in between them making them move closer together and looked like kissing.
Answer: In between the balloons
3. What does the behavior of the two balloons suggest about the pressure between them and the pressure on either side.
Answer: As the velocity increases, the pressure decreases; As we blew in between the balloons, the velocity increases so the pressure increases. Since the outside of the balloon has greater pressure than in between them, it pushes the balloon into lower pressure which is in between them making them move closer together and looked like kissing.
LEARNING STATION B
2. How do you explain your observation?
Answer: As we blew above the end of the loose paper, the velocity increases thus the pressure decreases so the high pressure below it pushes the paper up to the lower pressure area making the loose end of the paper to go up.
Answer: As we blew above the end of the loose paper, the velocity increases thus the pressure decreases so the high pressure below it pushes the paper up to the lower pressure area making the loose end of the paper to go up.
LEARNING STATION C
Switch on the hair blower and place the ball above the blower.
Questions and Answers:
1. Why does the ball tend to stay within the air column? Use an illustration to show the direction of the NET PRESSURE.
Answer: The ball tends to stay within the air column because the air within is faster which indicates higher velocity than its surrounding air.
Questions and Answers:
1. Why does the ball tend to stay within the air column? Use an illustration to show the direction of the NET PRESSURE.
Answer: The ball tends to stay within the air column because the air within is faster which indicates higher velocity than its surrounding air.
2. Why does this happen?
Answer: As what we can observe, the region where the ball is situated is in the low pressure area and it is also surrounded by high pressure area, so when the ball tries to leave the low pressure region, the high pressure region forces the ball to be pushed towards the area of low pressure. The air is actually traveling the fastest at the top of the ball that results to decrease of pressure.
Answer: As what we can observe, the region where the ball is situated is in the low pressure area and it is also surrounded by high pressure area, so when the ball tries to leave the low pressure region, the high pressure region forces the ball to be pushed towards the area of low pressure. The air is actually traveling the fastest at the top of the ball that results to decrease of pressure.
LEARNING STATION D
Blow air through the vertical straw.