All flashcards
Flashcard 1: Identify the correct unit to record a shadow length measured with a meter stick.
Answer: cm or m (use one unit consistently). Standard metric units allow comparison with other data sets.
Flashcard 2: Which variable should be kept the same each time when collecting shadow data daily?
Answer: The object and its position (same place and orientation). Consistent setup ensures shadow changes are due to Sun position only.
Flashcard 3: What is the main light source that causes outdoor shadows during the day?
Answer: The Sun. Earth's rotation makes the Sun appear to move, creating changing shadows.
Flashcard 4: Which statement correctly describes shadow length in early morning and late afternoon?
Answer: Shadows are usually longer. Low Sun angle creates extended shadows at day's start and end.
Flashcard 5: Which method best reduces measurement error when finding the end of a fuzzy shadow?
Answer: Measure to the darkest edge consistently each time. Consistent measurement point ensures reliable, comparable data.
Flashcard 6: What should you put on the y-axis when graphing shadow length measurements?
Answer: Shadow length (cm). Dependent variable (what you measure) goes on vertical axis.
Flashcard 7: What must you record to compare shadow changes fairly across different days?
Answer: The time of day for each measurement. Time tracking shows how Sun position affects shadow characteristics.
Flashcard 8: What is the best graph type to show shadow length changing over time during one day?
Answer: A line graph. Shows continuous change over time better than discrete data points.
Flashcard 9: Identify the best way to label a shadow data table for time and length.
Answer: Columns labeled “Time” and “Shadow length (cm)”. Clear labels with units ensure data can be understood and compared.
Flashcard 10: Find the shadow length: start at 12 cm and end at 63 cm on the ruler.
Answer: 51 cm. Subtract starting position from ending position: 63−12=51 cm.
Flashcard 11: What is the independent variable when you measure a shadow at different times?
Answer: Time of day. You control when to measure, making it the manipulated variable.
Flashcard 12: Which statement correctly describes shadow length near solar noon on a clear day?
Answer: The shadow is usually the shortest. Sun is highest in sky at solar noon, creating minimal shadow.
Flashcard 13: What tool is best for measuring shadow length accurately in centimeters?
Answer: A metric ruler or meter stick. Metric tools provide precise measurements needed for scientific data.
Flashcard 14: What should you put on the x-axis when graphing shadow length measured at different times?
Answer: Time of day. Independent variable (what you control) goes on horizontal axis.
Flashcard 15: What is a shadow (in science) in terms of how light travels?
Answer: A dark area where an object blocks light from reaching a surface. Shadows form when opaque objects prevent light from traveling through them.
Flashcard 16: What is the dependent variable when you measure how a shadow changes during a day?
Answer: Shadow length (or shadow direction). It changes in response to the Sun's position (independent variable).
Flashcard 17: Find the shadow length: start at 0 cm and end at 47 cm on the ruler.
Answer: 47 cm. Direct measurement from start to end point: 47−0=47 cm.
Flashcard 18: Identify the best way to represent daily shadow changes across a week at the same time each day.
Answer: A table or bar graph with day on x and length on y. Comparing same-time measurements shows seasonal shadow patterns.
Flashcard 19: Choose the correct data display: You measured shadow length at 9, 11, 1, and 3 o’clock.
Answer: A line graph with time on x and length on y. Line graphs best show how one variable changes over time.
Flashcard 20: Identify the best conclusion: 8 a.m. =120 cm, 12 p.m. =40 cm, 4 p.m. =110 cm.
Answer: The shadow is shortest at 12 p.m. Data shows typical pattern: shortest shadow at midday.
Flashcard 21: Find the median shadow length for the data (cm): 40,60,80.
Answer: 60 cm. Middle value when ordered: 40,60,80.
Flashcard 22: Identify the best graph type to show how shadow length changes continuously through one day.
Answer: Line graph. Shows continuous change over time with connected data points.
Flashcard 23: What should be placed on the x-axis when graphing shadow length measured at different times?
Answer: Time of day. Independent variable (what you control) goes on the horizontal axis.
Flashcard 24: What should be placed on the y-axis when graphing shadow length over a day?
Answer: Shadow length (with units, such as cm). Dependent variable (what you measure) goes on the vertical axis.
Flashcard 25: Which option correctly completes the pattern: shadows are usually longest at and ?
Answer: Morning and late afternoon. Sun is low in the sky at these times, creating long shadows.
Flashcard 26: Which option correctly completes the pattern: shadows are usually shortest around ?
Answer: Midday (around noon). Sun is highest in the sky at noon, creating shortest shadows.
Flashcard 27: Identify the correct conclusion: when the Sun appears higher in the sky, shadow length generally .
Answer: Decreases. Higher Sun angle means light hits more directly, shortening shadows.
Flashcard 28: Identify the correct conclusion: when the Sun appears lower in the sky, shadow length generally .
Answer: Increases. Lower Sun angle means light hits at a slant, lengthening shadows.
Flashcard 29: What is the definition of a shadow in a sunlight investigation?
Answer: A dark area where an object blocks light from reaching a surface. Shadows form when opaque objects prevent light from reaching surfaces.
Flashcard 30: Find the mean shadow length for 30 cm and 50 cm measurements.
Answer: 40 cm. Add values and divide by count: (30+50)÷2=40.