Science 8 ● Semester A

Question

Science 8 ● Semester A

Force and Motion Portfolio
Balloon Rocket Hands-On Lab

Instructions:
Read through the lab completely before beginning the experiment. Check the Lab Rubric at the end of this document for grading.
Collect all necessary materials before beginning the lab.
Create a copy of this lab so you can fill it out as you go. Do not request editing access. You can print it and write on it, or you can make a copy in Google Docs or Microsoft Word.
Save a finished copy of this worksheet that includes your answers. Upload it into the Unit 4 Lesson 12 Force and Motion Apply it Dropbox in Connexus.
Reach out to your science teacher if you have any questions!
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Materials Needed:
plastic drinking straw
plastic bag, about the size of an inflated balloon
paper streamers
fishing line, 25 ft (20-50g weight) or string (nylon [slippery] string works better than twine [rough])
long, tube-shaped balloon
tape measure or meter stick

Procedure:

Tape a drinking straw along the side of a plastic bag (see Figure 1).
Tape streamers along the open edge of the plastic bag.
Thread the string through the straw.
Tie each end of the string to a chair, and pull the chairs apart so that the string is taut (see Figure 1).
Position the bag at one end of the string, with the open end of the bag facing toward the chair.
Blow up a balloon (small size -about 5 inches wide) and put it into the bag, holding the balloon closed.
Countdown to zero, and let go of the balloon. . . ZOOOOM!
Measure the distance the balloon rockets traveled on the string and record in table
Repeat the process with the same sized balloon 2 more times and record your results in the table below.
Repeat steps 7-10 with a medium sized balloon (about 6-7 inches width when blown up) and record data of your 3 trials in your data table.
Repeat steps 7-10 with a large sized balloon ( 10 inches or more width when blown up) and record data of your 3 trials with this balloon.

I. Balloon Rocket Data Table
Directions: Predict the distance traveled along the string for a balloon that is filled with air so that it is small, medium and large in size. Then, record the actual distances traveled during three trials for each size balloon. *Don’t forget to include units*

Balloon Size
Predicted Distance
Trial #
Actual Distance Traveled

Small

1

2

3

Medium

1

2

3

Large

1

2

3

II. Balloon Rocket Questions

1. In this experiment, we can see Newton’s 3rd Law of Motion in action. For this experiment what is the action force and what is the reaction force?
Type Answer HERE:
2. As we added more air to the balloon, the balloon traveled further. Why is this the case? Explain.
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3. If you have an equal amount of force pushing on both sides of an item, what happens every time? Explain Why.
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4. A scientist wanted to move a golf ball and a bowling ball to both reach 15 mph. What would the scientist have to do differently for the bowling ball than the golf ball to reach his goal?
Type Answer HERE:

III. How do you graph motion? Video
Watch the following Video & then answer the questions following it.
Using Graphs to Describe Motion

IV. How do you graph motion? Questions

5. In the video, what color line for the Distance-Time graph represents the blue truck? Explain why.

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6. On the Velocity-Time graph, the black line represents the red truck. What does a flat line, that has zero slope, mean on a Velocity-Time graph? Explain why.

Type Answer HERE:
7. The Position-Time graph below, represents someone going for a walk. At what position is the person not moving and how do you know according to the graph?

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VI. Analyzing the Data:
8.

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The speed is constant.
The distance remains unchanged.
The direction of motion stays the same.
The speed gradually increases over time.

9.

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The ball’s speed is increasing.
The ball’s speed is decreasing.
The ball’s motion is constant.
The ball’s motion is stopping.

10.

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The object is experiencing acceleration.
The object is moving along a curved path.
The object has a negative acceleration.
The object moves at a constant speed.
11.

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The velocity of the car remains constant throughout the journey.
The change in speed alone causes the velocity of the car to vary.
The change in direction alone causes the velocity of the car to vary.
The velocity of the car changes due to the change in speed and direction.
12. Which graph BEST represents the relationship between velocity and time for an object that accelerates uniformly for 2 seconds, then moves at a constant velocity for 1 second, and finally decelerates for 3 seconds?
Type Answer HERE:

VII. Reading & Evidence Questions: Follow the instructions to open the required MyON Reading for this portfolio. Use the assigned books to help you answer the following questions.

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Answer 1

Bot GPT 4-o mini answered
4 days ago

Here is a structured format for your "Balloon Rocket Hands-On Lab" including predictions and possible answers to the questions provided. Please fill in your actual data during experimentation.

I. Balloon Rocket Data Table

| Balloon Size | Predicted Distance | Trial # | Actual Distance Traveled | |--------------|-------------------|---------|-----------------------------| | Small | 1 meter | 1 | ___ (fill in after trials) | | | | 2 | ___ (fill in after trials) | | | | 3 | ___ (fill in after trials) | | Medium | 2 meters | 1 | ___ (fill in after trials) | | | | 2 | ___ (fill in after trials) | | | | 3 | ___ (fill in after trials) | | Large | 3 meters | 1 | ___ (fill in after trials) | | | | 2 | ___ (fill in after trials) | | | | 3 | ___ (fill in after trials) |

II. Balloon Rocket Questions

Action and Reaction Forces:
- Action Force: The air rushing out of the balloon.
- Reaction Force: The balloon is pushed forward along the string.
Why does more air lead to further travel?:
- As we add more air to the balloon, we are increasing the amount of air pressure inside it. This increase in pressure creates a greater force when the air rushes out, resulting in a stronger thrust that propels the balloon further along the string.
What happens with equal force on both sides?:
- If there is an equal amount of force pushing on both sides of an object, it experiences no net force. This means the object will not accelerate and will remain at rest or continue moving at a constant velocity, according to Newton's First Law of Motion.
Moving a golf ball vs. bowling ball:
- To reach the same speed of 15 mph, the scientist would need to apply a greater force to the bowling ball compared to the golf ball because the bowling ball has a much larger mass, therefore requiring more force to achieve the same acceleration as the lighter golf ball (according to Newton's Second Law of Motion: F = ma).

III. How do you graph motion? Questions

Color line for the blue truck:
- The blue line represents the blue truck. This is identified visually in the graph based on the respective color coding assigned to each vehicle's motion.
Meaning of a flat line with zero slope:
- On a Velocity-Time graph, a flat line with zero slope indicates that the vehicle is not accelerating and is moving at a constant velocity (i.e., the speed remains unchanged).
Position of not moving on graph:
- The person is not moving when the graph shows a flat line (horizontal line), indicating constant position over time. This means there is no change in distance, which exemplifies that the person is stationary.

VI. Analyzing the Data Responses:

- “The speed is constant.” (Fill response based on observations from data).
- “The ball’s speed is increasing.” (Fill response based on observations from data).

“The object is experiencing acceleration.” (Fill response based on observations from data).

“The velocity of the car changes due to the change in speed and direction.” (Fill response based on observations from data).

Choose a graph that depicts uniform acceleration followed by constant speed and deceleration. (Fill response based on observations from data).

VII. Reading & Evidence Questions:

(Use the assigned books and materials to provide informed answers based on the relevant readings).

Make sure to fill in your actual data and responses based on your experiment and readings. Good luck with your lab!