1.5 drop and bounce lab (2013)

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1.05 Drop and Bounce Lab (2013)

Name

Overview: In this lab, we will test balls made of various materials. The matter that composes the ball must store energy on impact and then release the energy in a way that allows elastic recoil, or bounce. In addition to elasticity, there is also a relationship between the height from which the ball is dropped and the height of the bounce. We will measure and graph the relationship of those two variables.
Procedure:
1. Open the Drop and Bounce Virtual Lab and view the Tutorial. You can find this in lesson 1.05 page 3 and 4, or click on it here: http://ktwelvecontent.next.ecollege.com/K12Content/Courses/resources/swfs/media/Ninth_Grade/Science/Unit22254/Lesson86893/BOUNCE.swf
2. Drop each ball from heights of 20 cm, 40 cm, 60 cm, 80 cm, and 100 cm. In all cases, record the bounce height in the data table below.

Drop and Bounce Lab Report

1. (1 pt) If you had to guess from your past experiences, which type of ball do you think will bounce back highest? (golf, plastic, rubber, or clay) 2. (1 pt) From your experience, do you think rubber balls will bounce higher if they are dropped from a higher point? (yes or no)

3. (3 pts) Write a hypothesis predicting how a rubber ball will bounce when dropped from various heights. (Use an “if ---- then” sentence.)

For this experiment, we will measure the bounce height that results from dropping a ball. We will change the height from which it is dropped. We are testing the relationship of drop height and bounce height.
4. (1 pt) Which is the Independent Variable?

5. (1 pt) Which is the Dependent Variable?

6. (5 pts) Data Table: You will need to quickly estimate the height to which a ball bounces back. You will change the drop height and measure the results again.

Complete this data table

Type of Ball
Drop Height (cm)
Bounce Height (cm)
Golf
20
15
Golf
40
25
Golf
60
35
Golf
80
60
Golf
100
75
Plastic
20
13

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