[Title, period and [Title, period and name]name]

10/3/1310/3/13

ObjectivesObjectives

Objectives:Objectives: Part 1: Learn how to use a photogate Part 1: Learn how to use a photogate

timer and use it to determine the timer and use it to determine the velocity of an objectvelocity of an object

Part 2: To predict where a steel ball Part 2: To predict where a steel ball bearing will land on the groundbearing will land on the ground

MaterialsMaterials

Materials:Materials: [List the lab equipment [List the lab equipment needed]needed]

Photogate timer and gatePhotogate timer and gate ……

Procedures: (Part 2)Procedures: (Part 2)

[diagram][diagram]

Procedures: (Part 2)Procedures: (Part 2)1.1. Find the velocity of a steel ball from Find the velocity of a steel ball from

1.00 m up the ramp (Part 1)1.00 m up the ramp (Part 1)

2.2. Measure the height of the table to 4 Measure the height of the table to 4 sig. figs.sig. figs.

3.3. Find the time that the steel ball will Find the time that the steel ball will be in the air forbe in the air for

4.4. Use time from step #3 to Use time from step #3 to calculatecalculate where the steel ball will landwhere the steel ball will land

Data TablesData Tables

Data Table: Finding Vx

Distance (m)

Trial 1 (s)

Trial 2 (s)

Trial 3 (s)

Trial 4 (s)

Trial 5 (s)

TimeAve (s)

0.400 0.500 0.600 0.700 0.800

Data: Calculated Prediction

• Diameter of ball: 2.540 cm

• Height of Table: ____

• Target distances: a) ___ b) ___ c) ___

for: dr = 1.000 m

trials 1) ___ 2) ___ 3) ___ 4) ___ 5) ___

CalculationsCalculations: (Part 2): (Part 2)Make sure you use the correct UNITS!!!Make sure you use the correct UNITS!!! Calc. #1:Calc. #1: [show work][show work] average time (t average time (tphotophoto))

Calc. #2:Calc. #2: [T-Chart][T-Chart] velocity (v velocity (vballball = v = vxx))

Calc. #3:Calc. #3: [T-Chart][T-Chart] time (t time (tairair))

[projectile y-component][projectile y-component] Calc. #4:Calc. #4: [T-Chart][T-Chart] horizontal distance (d horizontal distance (dxx))

[projectile x-component] [projectile x-component]

This is your predicted distanceThis is your predicted distance

Testing the PredictionTesting the Prediction

Place and tape the target on the floor Place and tape the target on the floor with the “Target Line” at the distance with the “Target Line” at the distance that your prediction calculation.that your prediction calculation.

Order of the lab• Title:

• Objectives:

• Materials:

• Procedures: (Part 2 w/ diagram)

• Data Table: (For Part 1)

• Data: (For Part 2)

• Part 2 Calculations:

• Part 1 Calculations:

• Conclusion:

Part 2 Calculations: (T-Charts)

• Calc. #1: (show work) average time (tphoto)

• Calc. #2: velocity (vball = vx)

• Calc. #3: time (tair)

• Calc. #4: horizontal distance (dx)

• Error Analysis: (3 total - show work)

• Calc. #5: vertical velocity (vy)

• Calc. #6: resultant velocity (vr)

Error AnalysisError Analysis Measure distances from target (3 total)Measure distances from target (3 total) Calculation the % errorCalculation the % error

Show your workShow your work Calc. #5:Calc. #5: (T-Chart) vertical velocity (v (T-Chart) vertical velocity (vyy))

Calc. #6:Calc. #6: (T-Chart) resultant velocity (v (T-Chart) resultant velocity (vrr))

(target distance)% error = × 100

(predicted distance)

Part 2: Calculations

• Calc. #1: (show work) average time (tphoto)

• Calc. #2: horizontal velocity (vball = vx)

• Calc. #3: time (tair)

• Calc. #4: horizontal distance (dx)

• Error Analysis: (3 total - show work)

• Calc. #5: vertical velocity (vy)

• Calc. #6: resultant velocity (vr)

Part 1:Calculations (5 total T-Charts)

• Calc.: horizontal velocity (vball = vx)

Calculations: Calculations: (Part 1)(Part 1)

For each distance:For each distance: Calculate the velocity of the ball in Calculate the velocity of the ball in

meters per second (m/s) using the meters per second (m/s) using the diameter of the ball to be 2.540 cm. diameter of the ball to be 2.540 cm. (5 T-Charts Total)(5 T-Charts Total)

Conclusion (paragraph Conclusion (paragraph form)form) Explain the process of finding the velocity of the Explain the process of finding the velocity of the

ball bearing and how you predicted where the ball ball bearing and how you predicted where the ball bearing would land.bearing would land.

Identify Identify ALLALL variables in the lab as independent, variables in the lab as independent, dependent or controlleddependent or controlled

How many sig. figs. does each variable have?How many sig. figs. does each variable have? How much of a role do you think air resistance and How much of a role do you think air resistance and

friction had and how would it affect your predicted friction had and how would it affect your predicted horizontal distance to the actual distance?horizontal distance to the actual distance?

How far off was your prediction in terms of How far off was your prediction in terms of distance and percent error?distance and percent error?

What may have caused the ball to be off target? What may have caused the ball to be off target? (give at least 3 reasons)(give at least 3 reasons)

Order of the lab• Title:

• Objectives:

• Materials:

• Procedures: (Part 2 w/ diagram)

• Data Table: (For Part 1)

• Data: (For Part 2)

• Part 2 Calculations:

• Part 1 Calculations:

• Conclusion: