Analyzing Data: Review for 1st Quarter Test Midterm

1. Review for 1st Quarter Test Midterm

2. Analyzing Data • Look at the task list to the right, place an: • Place an M for things to be measured • Place a C for the things to be calculated • Place a D for things to be investigated • Rank the “Things to record” in order of how they should be done. • Fill in the table for the units of measurement for what is being recorded. • Fill in the table for the Symbol used to represent what is being recorded

3. Analyzing Data • Create a table with the following information. • Car • Height • Mass • Distance • Time • Velocity • Acceleration IT SHOULD LOOK LIKE THIS!!! • Now put this information into your data table (each car started at the top of a 1 meter ramp): • Yellow car – 1.35 Meters – 0.26 seconds – 2 kilogram • Blue car – 1.35 Meters – 0.26 seconds – 0.5 kilogram • Red car – 1.35 Meters – 0.26 seconds – 1 kilogram

4. Analyzing Data IT SHOULD LOOK LIKE THIS NOW THAT IT’S FILLED OUT!!! Use the formula V = d/t to calculate the velocity for each of the different cars. After you find the velocity, use the formula a = v2/h to determine the acceleration.

5. Analyzing Data What do you notice about the relationship between the mass of the cars and their acceleration? Now make a graph comparing the mass and acceleration.

6. Analyzing Data 30 1st – Label your axes 2nd – Indicate the scale on x and y axes 15 3rd – Graph the data Acceleration – a – m/s2 4th – draw a line connecting the data points 0 0 1 2 Mass – m - kg Review:Looking at the graph, do you need to change your statement about the relationship between mass and acceleration that you created on the previous slide? Question:If F = M * a, as Newton’s Law states, what can you conclude about the relationship between the masses of the cars and the forces causing those cars to roll?

7. Modeling Energy Car’s mass = 1 kg Total Energy Kinetic Energy Potential Energy Ramp Height 0 J 10 J 10 J 1 meter 10 J 5 J 5 J 0.5 meter 10 J 10 J 0 meter 0 J Use these formulas to find the answers for the blank boxes above: EP = m*g*h EK = ½ * m * v2 ET = EP + EK # Remember the units for energy is Joules – J – kg * m/s2. What is the law of conservation of energy? Using the model above, justify why the conservation of energy is true.

8. Momentum – P=m*v Before the cars collide What is the momentum of the blue car before the collision? 2. What is the momentum of the blue and yellow car after the collision? Yellow car => Mass = 2 kg; velocity = 0 Blue car => Mass = 0.5 kg; velocity = 2 m/s After the cars collide 3. What is the velocity of the blue and yellow cars together?

9. Momentum – P=m*v Before the cars collide What is the momentum of the yellow car before the collision? 2. What is the momentum of the yellow and blue car after the collision? Yellow car => Mass = 2 kg; velocity = 2 m/s Blue car => Mass = 0.5 kg; velocity = 0 m/s After the cars collide 3. What is the velocity of the yellow and blue cars together?

10. Impulse and Momentum Fill out the table below with the information provided: Yellow car – mass = 2 kg; v = 5.19 m/s; acceleration = 26.94 m/s2; Blue car – mass = 0.5 kg; v = 5.19 m/s; acceleration = 26.94 m/s2; Red car – mass = 1 kg; v = 5.19 m/s; acceleration = 26.94 m/s2; Now add the stop times for a wall and pillow: tWall = 0.002 seconds tPillow = 0.2 seconds

11. Impulse and Momentum Use the following formula to finish filling out the table: F = (m*v) / t

12. Refine and Design • Here’s what you can use to improve the design: • Piece of 2" x 4" x 2" wood. • Paper towels (10) • Egg Cartons (2) • Foam 2" x 12" x 4“ • Scissors • Tape • Glue • Bungee cord • Large rubber band • Nails Refine Colin's design with materials from the available materials list. List your materials & make your drawing detailed enough so one of your classmates could build it.