1. Measure the length of the track (already set up by your teacher) in meters and record in table 1. Use a meter stick for this.
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1 Hot Wheels Speed Lab Name: Purpose : To calculate the speed of different hot-wheels cars. Procedure: 1. Measure the length of the track (already set up by your teacher) in meters and record in table 1. Use a meter stick for this. 2. Get the number of Hot Wheels cars equal to the number of people in the group. 3. Time how long it takes for car 1 to get to the bottom of the track (record in Table 1 ). Record your answer to the tenths (one past the decimal point). 4. Repeat step #3-- 3 more times for car 1, recording the time in the table. 5. Repeat steps 6 & 7 for the remaining cars. 6. Calculate the average time for each car. Round all answers to the tenths place. 7. Calculate the speed for each car. Round all answers to the tenths place. Data Car 1. Distanc e (m) Trial 1 Trial 2 Trial 3 Trial 4 Average time Speed = distance/time (m/s)
2 Conclusion questions: 1. When calculating speed, are you calculating the fastest speed, average speed, or slowest speed? 2. List at least 2 factors that affected the speed of your car? (at least 2) 3. What could you do to your car and/or the ramp to make the car go faster? 4. What force is responsible for moving your car? 5. Why is it important to do more than 1 trial when finding the speed of your car?
3 Exploring Friction Student Objectives: 1) I know that friction is any force that opposes motion. 2) I understand that the amount of friction depends on the surface type and the amount of force pressing two surfaces together. Materials: Matchbox cars Textbooks (or other large books) Beach towel Incline plane Meter stick Stopwatch Activity 1: Matchbox cars Will the matchbox car move faster on the smooth surface or the rough surface? Procedure : 1. Use the meter stick to measure the length of the incline plane. This will be the ramp for the cars. 2. Next, place a stack of books (about 30 cm high) under one end of the ramp. (You may want to put another book at the other end to keep the board from sliding.) 3. Before beginning the trials, make a hypothesis indicating which surface will produce the least friction (and therefore the fastest speed/motion). 4. Next, using the stopwatch, record the time it takes the matchbox to travel down the ramp. Repeat 3 times for a total of four trials. Be sure to use the same starting point at the top of the ramp each time. Record your results! 5. Calculate the average time for the matchbox to travel down the ramp. Now use the known distance (length of ramp) and the average time to calculate the average speed of the matchbox car. (Remember: S = D/T) 6. After completing all four trials, cover the ramp with the beach towel to create a new surface for the matchbox car and repeat steps 4 and Determine which surface produced more friction. Answer conclusion questions. 3. Now using the same pinky, try pushing two books stacked on top of one another across the lab station. Push only on the bottom book. Try to keep the applied force at the same angle (parallel with the table) each time. 4. Record observations. Answer conclusion questions how does force affect friction?
4 Activity 1: Matchbox cars Will the matchbox car move faster on the smooth surface or the rough surface? Hypothesis: If Data: 1) Length of ramp = (Don t forget the units!) Show your work! 2) Wooden Ramp: Time Trail 1 Trail 2 Trail 3 Average Average Speed: 3) Beach Towel Ramp Time Trail 1 Trail 2 Trail 3 Average Average Speed: 4) Which surface produced more friction? How do you know? 5) What does this tell you about how friction relates to surface type?
5 Activity 2: Moving Textbooks Will it be easier to move one or two textbooks across your desk with your pinky? Procedure: 1. Before you begin, make a hypothesis. 2. Using only your pinky, try to move just one book across the lab station. Will it be easier to move one or two textbooks across your desk with your pinky? Hypothesis: Observations: 1) Moving one book with pinky: 2) Moving two books with pinky: 3) Where is more friction present? How do you know? 4) What is causing the additional friction? 5) How does friction relate to the amount of force on a surface?
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