Copy the table and record your observations. Then draw a bar graph to show the distance elastic band moved when stretched at different distances. Use the graph sheet provided.

Here are the solutions for the remaining questions from your investigation:

PART B: ANALYSIS AND CONCLUSION

7.1
I cannot fill in the table for you as I do not have the experimental observations. You would need to record the actual distances the elastic band moved for each stretch length (5 cm, 10 cm, 15 cm, 20 cm) in the "Distance elastic band moved (m/cm)" column.

7.2
I cannot draw the bar graph for you. You would need to use the data from your completed table in 7.1 to draw a bar graph.

• The horizontal axis should be "Length of the stretch of the elastic band (cm)".
• The vertical axis should be "Distance elastic band moved (m/cm)".
• Draw a bar for each stretch length, with the height of the bar corresponding to the distance moved.

1.
As the stretch distance increased, the $\boxed{\text{distance the elastic band moved also increased}}$.

2.
When the elastic band was released, it $\boxed{\text{snapped back to its original shape and moved forward}}$.

3.
The type of energy found in the elastic band when stretched was $\boxed{\text{elastic potential energy}}$.

4.
The $\boxed{\text{20 cm stretch level}}$ caused the greatest movement.

5.
Based on the expected results, I $\boxed{\text{agree}}$ with my hypothesis.

6.
In conclusion, this investigation showed that $\boxed{\text{the greater the distance an elastic band is stretched, the greater the distance it will move when released. This supports the hypothesis that elastic potential energy stored in a stretched band is converted into kinetic energy upon release, causing movement.}}$

PART C: APPLICATION OF KNOWLEDGE

1.
This is like stretching an elastic band because $\boxed{\text{when the child pulls back the toy car, they are storing potential energy (often in a spring or elastic mechanism) which is then converted into kinetic energy when released, causing the car to move.}}$

2.
When the mat returns to its original shape, it $\boxed{\text{releases the stored elastic potential energy, converting it into kinetic energy to propel the person upwards}}$.

3.
Knowledge of elastic energy helps engineers design safety equipment by allowing them to $\boxed{\text{create materials and structures that can absorb impact by deforming and storing energy, thereby reducing the force transmitted to a person or object. Examples include car bumpers, helmets, and safety harnesses.}}$

4.
You would use a stretching material to make sportswear because it $\boxed{\text{provides flexibility and allows for a full range of motion, enhancing comfort and performance during physical activity.}}$