Ch3 HW1 (Homework)
Arthur Barfield
PHYS 2211, section M, Fall 2008
Instructor: Jennifer Curtis
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Assign
Current Score:
26.8 out of 36
Due:
Tuesday, September 9, 2008 01:58 PM EDT
Description
Nonconstant forces, including spring forces
Instructions
Readings: Sections 3.13.3
The due date for this assignment is past.
Your work can be viewed below, but no changes
can be made.
1. [MI2 03.X.00]
4/4 points
During a time interval of one second, a ball moves in the +
x
or 
x
direction (that is, to the right
or the left), and a net force acts on the ball in the +
x
or 
x
direction. For each motion listed
below, check
all
the descriptions of net force that could produce that behavior. More than one
description may be valid for a particular motion.
(a) ball permanently at rest
net force to the left with constant magnitude
net force to the left with decreasing magnitude
net force to the right with increasing magnitude
net force = 0
net force to the right with decreasing magnitudenet force to the left with
increasing magnitude
net force to the right with constant magnitude
(b) ball moving to the right at constant speed
net force to the right with decreasing magnitude
net force to the left with increasing magnitude
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net force = 0
net force to the left with decreasing magnitude
net force to the right with constant magnitude
net force to the left with constant magnitude
net force to the right with increasing magnitude
(c) ball moving to the left at constant speed
net force to the right with decreasing magnitude
net force = 0
net force to the left with constant magnitude
net force to the left with decreasing magnitude
net force to the right with constant magnitude
net force to the left with increasing magnitude
net force to the right with increasing magnitude
(d) ball moving to the right with increasing speed
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 Spring '09
 Kindermann
 Current, Force, Work, General Relativity, Fundamental interaction, Fundamental physics concepts, net force

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