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Chapter 4 Opening
Friday, September 28:
Textbook, p. 95, #11 and #13
Monday, October 1:
Consider the following statement:
"Motion at a constant speed requires a
constant force in the direction of motion."
Is it true or not true? Give reasons why you think it
is true or not true or give examples of when it is or is
A rightward moving object is coasting to a stop along
a straight, level surface. The net force acting upon the
object MUST be ____.
b. directed rightward
c. directed leftward
d. ... impossible to answer without further
Discuss the principle which you used to make your
decision on the answer.
Tuesday, October 2:
The dot diagram below (particle model diagram)
depicts the motion of a rightward-moving object. Which of
the force diagrams is consistent with the dot diagram?
(The arrows on the force diagrams represent forces; the
length represent the size of the force.) List all that
Wednesday, October 3:
Suppose that you are on a roller coaster ride.
At the crest of a small hill you experience a momentary
sensation of weightlessness. Describe what weightlessness
is and explain why you experience this momentary
sensation of weightlessness.
Thursday, October 4:
A 62-kg skydiver is falling downward and
experiencing 345 N of air resistance force. Draw a
free-body diagram showing the forces upon the skydiver.
Label each force according to its type. Then calculate
the acceleration of the skydiver.
Friday, October 5:
Late one night, an unfortunate bug collides with
the windshield of a fast-moving bus. The force of the
bus on the bug is _____ (equal to, greater than, less
than) the force of the bug on the bus; the resulting
acceleration of the bug is ____ (equal to, greater than,
less than) the acceleration of the bus.
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