13. ajit hypothesized that the force needed to move a wood block would remain the same regardless of the mass of the wood block. he used a spring scale to pull a wooden block across the table at a constant velocity. his results are shown in the table below.
effect of mass on force
mass force
10 g 2.5 n
20 g 4.0 n
30 g 5.5 n
although his hypothesis is not supported, what can be concluded from the data?
a. that the force needed to move a mass is not affected by the mass
b. that larger masses require increased force to move them
c. that larger masses require decreased force to move them
d. that larger masses required double the amount of force to move them than the previous mass
14. katrina has been studying the fish populations in a large local lake for several years. based on last years results, she hypothesized that most of the trout in the lake this year would be young females weighing less than 2 pounds. she tested her hypothesis by catching and weighing 65 trout. her results are shown in the graph below.
katrinas results did not support her hypothesis. based on her results, which of the following is the best question for katrina to investigate next?
a. how many trout were born in the last year?
b. how many trout fishermen have fished in the lake recently?
c. how many small female trout were caught by other researchers?
d. how have the resources available to the trout changed in the last year?

Question

13. ajit hypothesized that the force needed to move a wood block would remain the same regardless of the mass of the wood block. he used a spring scale to pull a wooden block across the table at a constant velocity. his results are shown in the table below.
effect of mass on force
mass    force
10 g    2.5 n
20 g    4.0 n
30 g    5.5 n
although his hypothesis is not supported, what can be concluded from the data?
a. that the force needed to move a mass is not affected by the mass
b. that larger masses require increased force to move them
c. that larger masses require decreased force to move them
d. that larger masses required double the amount of force to move them than the previous mass
14. katrina has been studying the fish populations in a large local lake for several years. based on last years results, she hypothesized that most of the trout in the lake this year would be young females weighing less than 2 pounds. she tested her hypothesis by catching and weighing 65 trout. her results are shown in the graph below.
katrinas results did not support her hypothesis. based on her results, which of the following is the best question for katrina to investigate next?
a. how many trout were born in the last year?
b. how many trout fishermen have fished in the lake recently?
c. how many small female trout were caught by other researchers?
d. how have the resources available to the trout changed in the last year?

Accepted Answer

# Brief Explanations:
1. For question 13: As the mass of the wood - block increases (from 10 g to 20 g to 30 g), the force needed to move it at a constant velocity also increases (from 2.5 N to 4.0 N to 5.5 N). So, larger masses require increased force to move them.
2. For question 14: Katrina's hypothesis about the trout population was not supported. The resources available to the trout can significantly affect their growth, survival, and population structure. Investigating how resources have changed can help understand the unexpected results.

# Answer:
13. C. that larger masses require increased force to move them
14. D. How have the resources available to the trout changed in the last year?

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