     Bounce Back Ball

Contributed by: Maryland School Performance Assessment Program (MSPAP)

### Description:

Students will be working in teams of four to measure the rebound heights of a tennis ball dropped form four different heights. Students wil be investigating with the bouncing balls to measure changes in the type of energy they possess.

This task is designed to take approximately 65 minutes.

Physical Science

### Performance Expectations:

• collecting data on the rebound heights of a tennis ball
• using a meter stick to measure the heights of ball bounces
• representing data in the proscribed table and graph
• using addition and division to determine the mean

### National Council of Teachers of Mathematics:

Data Analysis and Probability Standards 1:Formulate questions that can be addressed with data and collect, organize, and display relevant data to answer them.

e. collect data using observations, surveys, and experiments

f. represent data using tables and graphs such as line plots, bar graphs, and line graphs

Measurement Standards 1: Understand numbers, ways of representing numbers, relationships among numbers, relationships amoung numbers, and number systems.

g. carry out simple unit conversions, such as from centimeters to meters, within a system of measurement

Measurement Standard 2: Apply appropriate techniques, tools, and formulas to determine measurements.

c. use tools to measure

Number nand Operations Standard 3: Compute fluently and make reasonable estimates.

g. develop fluency in adding, subtracting, multiplying, and dividing whole numbers

### General Instructions to the Teacher:

This task is designed to take students approximately 65 minutes.

Students will be working both in groups and individually during this exercise.

Students should be ready to work as soon as the period begins. The materials should be set out at each lab station, if possible. A central supply area, if needed, should be easily accessible. All supplies should be clearly labeled.

### Materials for "Bounce Back Ball":

At each station students should have:

• 1 tennis ball
• 1 meter stick
• 2 sheets of scrap paper for recording data
• masking tape (enough to hold the meter stick to the wall)
• 4 calculators

• Prior to testing, familarize yourself with the teacher demonstration.
• Tape a meter stick to the wall so 0 cm is on the floor and 100 cm is at the top. Be sure that the students will be able to see the stick when they are viewing the demonstration as a group.
• Write the following definitions on the chalkboard:

Energy-the ability to do work
Potential energy-the energy that is stored in an object by its position or chemical composition
Kinetic energy-the energy of matter in motion
• Write the following assignments on the chalkboard:

Ones-(the tapers) tape the meter stick to the wall or any stable vertical surface
Twos-(the droppers) drop the ball
Threes-(the spotters) sit on the floor and take the measurement carefully, looking straight at the meter stick
Fours-(the recorders) record the measurement

• Plan to assign studentes to groups of four. Assgn each student a number from 1-4. If you do not have four students in a group, students may double up on assignment.
• Prior to testing, remember to review with the students the Language Usage icon in Resource Book.

### Safety:

• Be careful.
• Teachers and students should always exercise appropriate safety precautions and utilize appropriate laboratory safety procedures and equipment when working on science performance tasks.

### Extensions/modifications:

• Ask students to carry out simple unit conversions (i.e.cm-meter)  