Education Technology

### Murder in the First Degree - The Death of Mr. Spud

Students model the process of cooling and use a cooling curve to simulate a forensic scenario to predict the time of death. They use technology to find an exponential plot.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Forensics Case 2 - Bouncing Back: Using ground-penetrating radar to locate buried objects

In this activity, students gather data to explore the use of ground-penetrating radar (GPR) to find buried materials. They use a range finder to detect the presence of an object and to distinguish between different-shaped objects. They find the buried car and help solve a case.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Forensics Case 3 - Name That Tune: Matching musical tones through waveform analysis

In this activity, students analyze sound waves to calculate the frequency or pitch of musical notes. They use a Microphone to detect the waveform of a musical note. Students calculate the frequency of a musical note from the period of its waveform and use this knowledge to identify the musical notes that make up the combination to a safe.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus

### Forensics Case 4 - Flipping Coins: Density as a characteristic property

In this activity, students identify counterfeit coins based on the characteristic property of density. They model data using a linear equation, interpret the slope and intercept values from a linear model, and identify a characteristic property of a substance.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Forensics Case 5 - The Ink Is Still Wet: Using colorimetry to identify an unknown ink

In this activity, students identify the ink of a ransom note to match suspects. They identify an unknown ink by its light absorbance characteristics. The experiment set up used is to measure a solutions absorbance of different colors (wavelengths) of light.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Forensics Case 6 - Measuring Momentum: Using distance moved after impact to estimate velocity

This activity introduces the concept of momentum as it applies to vehicle collisions. Students accurately gather data of collision of a vehicle with a stationary object, and establish a relationship between the distance an object moves after a collision with a vehicle and the momentum of the vehicle.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Forensics Case 7 - Drug Tests: Identifying an unknown chemical

In this activity, students distinguish between physical and chemical properties. They also understand the differences between qualitative and quantitative observations. They use quantitative and qualitative analyses to identify an unknown powder.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Forensics Case 8 - No Dumping: Using soil characteristics to link suspects to a crime scene

In this activity, students measure pH, conductivity, and water absorbency of different samples of soil. They use these characteristic properties to identify soil samples. They use the physical and chemical characteristics of soil samples collected from suspects to determine whether a suspect had been at a scene of crime.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Forensics Case 9 - Killer Cup of Coffee: Using colorimetry to determine concentration of a poison

In this activity, students will use colorimetry to determine the concentration of a colored species in a solution and use a linear relationship to model Beer's law. They use Beer's law to determine the concentration of iron(III)thiocyanate (FeSCN2+) in an unknown solution.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Forensics Case 10 - Dropped at the Scene: Blood spatter analysis

In this activity, students graph data to find quantitative relationships and create a standard reference curve for comparison with unknown data. They analyze blood spatters and examine r2 values for linear, natural logarithm, quadratic, and power curve fit. They find the curve that best fits the data and use it to determine the height from which blood has dropped.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Forensics Case 11 - Ashes to Ashes: Using evaporation rate to identify an unknown liquid

In this activity, students understand that evaporation rate is a characteristic property of a liquid. Based on this fact, they identify the solution and the likely accelerant in a case of arson. They compare the evaporation rates of the accelerants found with the suspects with those near the crime site.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Forensics Case 12 - Hit and Run: Using information from an event data recorder to reconstruct an ac

Students learn how distance traveled, velocity, and acceleration are related to one another and how the appearance of an acceleration, velocity, or distance vs. time graph can be used to predict the appearance of the other graphs. They show how accident scenes can be recreated through an analysis of the data that are gathered by an event data recorder (EDR).
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Forensics Case 13 - Life in the Fast Lane: Using skid marks to determine vehicle speed

Students determine the coefficient of friction between a vehicle and a road surface. They use the length of the skidding distance to determine the speed of a vehicle before its brakes were applied. Students convert between SI units and Imperial units and rearrange equations to solve for different variables.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family