HOMEWORK FOR LAB 4: FORCE AND MOTION

Please list the members of your group:

Use complete sentences!

Make sure you use units, when necessary!

Question 1: You are given 10 identical springs. Describe how you would develop a scale of force (i.e., a means of producing repeatable forces of a variety of sizes) using these springs.

Question 2: Describe how you would use an un-calibrated force sensor and the springs in Question 1 to develop a quantitative scale of force. How could you measure forces that do not correspond to exact numbers of stretched springs?

Question 3: What is meant by a proportional relationship? Is this the same as a linear relationship? Explain.


Copyright © 2018 John Wiley & Sons, Inc.

HOMEWORK FOR LAB 4: FORCE AND MOTION

Question 4: Given the table of data below for widgets and doodads, explain how you would determine if the relationship between widgets and doodads is a proportional one.

Question 5: Describe in words what the graph of Widgets vs. Doodads would look like if widgets are proportional to doodads.

HOMEWORK FOR LAB 4: FORCE AND MOTION

Question 6: A force is applied that makes an object move with the acceleration shown below. Assuming that friction is negligible, describe in words how a graph of the force on the object as a function of time would look. Explain your answer.

HOMEWORK FOR LAB 4: FORCE AND MOTION

A cart can move along a horizontal line (the + position axis). It moves with the velocity shown below.

Question 7A: Describe in words the acceleration–time graph of the cart’s motion.

Question 7B: Assuming that friction is so small that it can be neglected, describe in words the force–time graph to keep the cart moving with this velocity and acceleration.

Question 7C: Explain both of your graphs.

HOMEWORK FOR LAB 4: FORCE AND MOTION

Questions 8–10 refer to an object that can move in either direction along a horizontal line (the + position axis). Assume that friction is so small that it can be neglected. Describe in words the graph of the force applied to the object that would cause the motion described to continue. Note that the positive direction is toward the right.

Question 8: The object moves toward the right with a constant velocity.

Question 9: The object moves toward the left with a constant velocity.

Question 10: The object moves toward the right with a steadily increasing velocity (a constant acceleration).

HOMEWORK FOR LAB 4: FORCE AND MOTION

Questions 11 and 12 refer to an object that can move along a horizontal line (the + position axis). Assume that friction is so small that it can be ignored. The object’s velocity–time graph is shown below.

Question 11: Describe in words the shapes of the acceleration–time and force–time graphs

Question 12: Suppose that the force applied to the object were twice as large. Describe in words how the force, acceleration, and velocity vs. time graphs would be changed.

HOMEWORK FOR LAB 4: FORCE AND MOTION

An object can move along a horizontal line (the + position axis). Assume that friction is so small that it can be ignored. The object’s velocity–time graph is shown below.

Question 13A: Describe in words the shape of the acceleration–time graph for the graph above.

Question 13B: Describe in words the shape of the force–time graph for the graph above.

ALL DONE!

Please remember to edit the report (insert your name - and if necessary your partners), export the report and submit it on D2L.


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