warm-up determine the speed of a rocket that traveled 148 meters in 7.0 seconds. (show all steps)...
TRANSCRIPT
Warm-upWarm-up• Determine the SPEED of a rocket that
traveled 148 meters in 7.0 seconds. (Show ALL steps)
• Round to nearest tenth. Make sure to add a label.
As a result of this lesson As a result of this lesson you will be able to calculate you will be able to calculate
the speed of a moving the speed of a moving object and determine factors object and determine factors
that affect motion.that affect motion.
Marble Speed LabMarble Speed Lab By Mr. HarveyBy Mr. Harvey
Partners 5-6Partners 5-6Mary Grace
Dhruv James
Madison Kelly
Grace Caitlin
Nicholas Ryan
Julia Katriana
Jenna Brittney
Wesley Alec
Michele Krista
Joshua David
David Man. TreyAnastasia Katie
Partners 7-8Partners 7-8
Brian Martin
Vanessa Maxwell
KC Abby
Erica Melanie
Dillon Zachary
Brandon Nicholas
Adam Sawyer
Steven Nathan
Jacob Pardu
Emily Joshua
Ryan Christian
Partners Pd 9 Partners Pd 9
David Cody
Sean Charles
Caitlin HaileyNikhil JacquezGarrett AdamLindsay Mary
Theodore Philip
Rebecca Mikala
Ciara Mikayla
Joseph Joseph Blake
Chase Teddy
Ryan Oscar
Jad Lucas
ProceduresProceduresStep 1Step 1
• Find a space on the floor that is smooth and level for a distance of about 1.5 meters.
• You must be able to see the second hand on a watch, stop watch, or clock.
• Sit down with your group once you find your spot and place one hand on your head when you are ready to move forward. (You will do this when your group finishes each step of the lab.)
3
Materials NeededMaterials Needed(2 minutes to gather)(2 minutes to gather)
• two grooved metric rulers per group• 2 meter sticks per group • one marble per group• 1 answer sheet per person in group • 1 Calculator per group• 1 Stop watch per group• 1 pencil per person in group• 2 science books
• Please do not bounce or play with the marble!• http://www.youtube.com/watch?v=fjWM_KnjvPY
0
Materials that you should have in Materials that you should have in your area:your area:
• http://www.youtube.com/watch?v=hvEg2gH2gg8
Step 2Step 2
• Place a ruler so that one end is raised 1.5 cm at the 25cm mark, and the other end is on the floor.
• Hint: Use your science book and turn to a page that creates the correct height. Close your book and re-check the height.
2
Step 3Step 3
• Using a marble, how can you tell if the floor is level?
• Discuss the answer with your group and write down what you think on your answer sheet in the space provided.
• Please use complete sentences.
3
Step 4Step 4
• Roll a marble down the groove and onto the floor. Start the marble from the higher end of the ruler at the 25 cm mark.
• Measure and record how far the marble rolls in two seconds. Start measuring from the bottom end of the ruler where it touches the floor. Don’t start to count until the marble hits the floor.
2
Step 4 ExampleStep 4 Examplehttp://www.youtube.com/watch?v=jQ-0bnnikYUhttp://www.youtube.com/watch?v=jQ-0bnnikYU
Step 5Step 5
• Repeat step 4 procedure three times. Record the distance each time on your answer sheet in chart 1.5.2.
Step 6Step 6
• To find the average distance the marble rolled in two seconds, add together the three distances measured for a total number. Divide this total number by three.
• Write the average distance in the box labeled average distance on chart 1.5.2
• Make sure to label the correct units.
3
Step 7Step 7
• S=D/T To find the average speed of the marble, divide the average distance traveled by the time it takes to travel that distance. For instance, if the marble rolled 30 centimeters in two seconds,
its average speed would be 30 cm ÷ 2 seconds or 15 cm per second (15 cm/s). Write the average speed per second after letter B on your answer sheet. Remember to label.
Step 8Step 8
• Determine how far the marble rolls from the end of the ruler in 3 seconds.
• Measure and record three more trials. • Record your measurements in chart 1.5.3
3
Step 9Step 9
• Place another ruler at the lower end of the first ruler so that the marble will pass directly from one ruler onto the other. Make sure that the zero ends of the rulers meet in the middle.
• Raise the far ends of both rulers 1.5 cm above the floor.
Step 11Step 11
• Prediction: If the marble is released from the 25 cm mark on one ruler, predict how high the marble will role up the second ruler.
• Write your prediction in a complete sentence on number 4 of your answer sheet.
• Example: http://www.youtube.com/watch?v=rbuncwAiiHE
• Test your prediction. Write your result on number 5 of your answers sheet.
3
Step 11Step 11
• Answer the rest of the questions on your answer sheet.
• When you have finished, turn-in your answer sheet and put all materials back where they belong.
6. Is the average speed of the 3 second 6. Is the average speed of the 3 second runs >, <, or = to the average speed during runs >, <, or = to the average speed during
the 2 second runs?the 2 second runs? Explain whyExplain why..
• The average speed of the 3 second run is less than the two second run because the marble had more time to slow down due to friction.
7. If the direction in which the 7. If the direction in which the marble was rolling was included, marble was rolling was included, what would the measurement be what would the measurement be
called?called?
• Velocity
8. What two forces are affecting 8. What two forces are affecting the motion of the marble?the motion of the marble?
•Friction and gravity
9. Why can we say that the marble 9. Why can we say that the marble is accelerating throughout its is accelerating throughout its
motion?motion?
Because it is speed up, slowing down, and changing direction.
10. 10. List 5 factors that you think List 5 factors that you think affected the speed of your marble.affected the speed of your marble.
• Dust on floor• Floor surface• Cracks in floor• Friction• Type of marble• If floor was level• Smoothness of ruler