Physics Review Question

Unit: mechanics
Year: 1997 Question#: 19
Question: The graph below shows the relationship between the elongation of a spring and the force applied to the spring causing it to stretch.


What is the spring constant for this spring?
(1 ) 0.020 N/m
(2 ) 2.0 N/m
(3 ) 25 N/m
(4 ) 50. N/m

What is this question really asking?




Explanation by: Becky G
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Answer 1
0.020 N/m

INCORRECT

Try chosing a point on the graph and using the formula F=kx and solving for k. return to top























Answer 2
2.0 N/m
INCORRECT

Try chosing a point on the graph and using the formula F=kx and solving for k. return to top



























Answer 3
25 N/m

INCORRECT

25 N/m would be only half the newtons to make the strtch be one meter. Try chosing a point on the graph and using the formula F=kx and solving for k. return to top


























Answer 4
50. N/m
CORRECT

By looking at the graph you can tell that the line passes through the point 50. N the same time it passes through the point 1.00 m. Therefore 50. N/m is the correct answer.
The other approach would be to choose a point on the graph and use the formula F=kx and solve for k. return to top


























What's this question really asking?

Can you read a graph and do you know what spring constant means? return to top

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