Physics

Materials

Ruler 5 N Spring Scale

Procedure

1. Zero the 5 N spring scale.

2. Lay the ruler on the table

3. Using the spring inside of the spring scale as a reference point, line up the end of the spring closest to the hooked end of the scale to the 0 cm mark on the ruler. Make sure the Newton scale is visible so you will be able to make measurements.

4. Pull the spring scale until the internal spring is stretched to the 1 cm mark on the ruler. Record the force reading on the spring scale in Table 1.

5. Repeat Step 3 for stretching distances of 2, 3, 4, and 5 cm.

Table 1: Spring Scale Force Data

Force (N)

Distance, x (m)

ForceAverage (N)

Δ Distance, Δx (m)

Work (J)

0

0

0.01

0.01

0.01

0.02

0.01

0.03

0.01

0.04

0.01

0.05

*Note, you will finish completing Table 1 in the Post-Lab Questions section.

Post-Lab Questions

1. Create a Force versus Displacement (stretch) graph.

2. Using the result of Pre-Lab Question 1, calculate the work done by the spring.

3. The work done by the spring can be broken down by the work done by each 1 cm stretch. Fill in the rest of Table 1 to calculate the average force applied by the spring over each 1 cm stretch.

4. Calculate the work done in each segment and determine the total work done by adding all of the segments together. How does this compare to the work done by the spring calculated in Post-Lab Question 2?

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Which of the following best describes how to calculate the average acceleration of any object?

 

ANSWER:

 

2.0 m/s

 

3.5 m/s

 

2.5 m/s

 

3.0 m/s

 

True

 

False

 

Average acceleration is always equal to the change in velocity of an object divided by the time interval.

 

Average acceleration is always halfway between the initial acceleration of an object and its final

 

acceleration.

 

Average acceleration is always equal to the displacement of an object divided by the time interval.

 

Average acceleration is always equal to the change in speed of an object divided by the time interval.

 

 

 

11/10/2014 HW_Week2

 

http://session.masteringphysics.com/myct/assignmentPrintView?assignmentID=2992507 27/29

 

 

Correct

 

 

 

 

Conceptual Question 2.13

 

 

Part A

 

 

 

 

An object is moving in a straight line along the xaxis.

 

A plot of its velocity in the xdirection

 

 

 

 

as a function of time is

 

 

 

shown in the figure. Which graph represents its acceleration in the xdirection

 

 

 

 

as a function of time?

 

ANSWER:

 

 

 

11/10/2014 HW_Week2

 

http://session.masteringphysics.com/myct/assignmentPrintView?assignmentID=2992507 28/29

 

11/10/2014 HW_Week2

 

http://session.masteringphysics.com/myct/assignmentPrintView?assignmentID=2992507 29/29

 

 

Correct

 

 

 

Score Summary:

 

 

 

Your score on this assignment is 97.1%.

 

You received 17.48 out of a possible total of 18 points.

 

 

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