A 5 kg bowling ball, a 0.25 kg baseball, and a 0.05 kg golf ball are dropped from a 100-meter high building. A camera catches the motion of the balls as they pass specific markers (in meters, m) on the building. The times (in seconds, s) that each object passes the markers are listed in the table below. Which of the following conclusions is true?

• Light objects fall faster than heavy ones.
  
• All objects fall at the same rate regardless of mass.
• Heavy objects fall faster than light ones.
• Objects of different shapes fall at the same rate

Tony recorded data from his chemistry experiment in the following table.  Which of the categories from Tony's data table includes qualitative observations?

• color
• temperature
• mass
• volume

Which of the following units would be the most appropriate for measuring the length of a football field?

• mililiters
• centimeters
• meters
• kilometers

Inferences are

• never made by scientists.
• questions that are made by studying conclusions or predictions.
• conclusions or predictions that are made by studying observations.
• exactly the same as observations

The level of closeness between multiple measurements of the same quantity is called __________.

• accuracy
• similarity
• precision
• congruence

Mr. Swanson's science class used a thermometer to measure the outside temperature each day throughout the school year.
They used their results to make the graph below.

Which month had an average daily temperature of around 41 degrees?

• May
• April
• December
• March

The pictures below show a field that is being studied over time. In the field, there are rabbits (red circles) and foxes (blue circles). What conclusion can be drawn from these observations?

• The number of foxes decreases as the number of rabbits increases.
• The number of rabbits and foxes remains constant over time.
• The number of foxes remains constant while the number of rabbits decreases.
• The number of foxes increases while the number of rabbits decreases.

Directions: Select the correct graph.
Mikey had two mice that were about the same age and weight. Mikey fed each of the two mice a different feed for a month. He measured how much the mice weighed every two days until the month was over. Mikey's results showed that although both mice gained weight over the month, mouse 2 gained more weight than mouse 1.Which graph below best shows these results?

• 1
• 2
• 3
• 4

Tags

CCSS.8.EE.B.5

Which statements about scientific explanations are true?I.Scientific explanations must prove that a hypothesis is true.
II.Scientific explanations should be based on evidence or data.
III.Scientific explanations must have logical and consistent arguments.
IV.Scientific explanations should use scientific principles, models, and theories. A. C.D.

• II, III and IV
• I, II and III only 
• I, II, III and IV 
• II and III only

A scientist collected the following data on algal growth during an experiment:
Which of the following conclusions could be drawn from the data? 

• Algae multiply most rapidly at 35°C.
• Algae multiply most slowly at 20°C.
• Algae multiply most slowly at 10°C.
• Algae multiply most rapidly at 20°C.