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Did you complete the reading assignment? (Typically this means at least
20-30 minutes looking over the assigned sections of the book.)
I throw a ball at an upward angle across a flat field. Neglecting air
resistance, at what part of its path
does the ball have its maximum speed?
right before it hits the ground
halfway to the top
at the top of its path
right after it leaves my hand
There's not enough information to say
projectile problems, usually you use equations from one of the directions to
figure out the time the projectile is in the air. (Look over the book examples,
see if they do this.)
Neglecting air resistance, at what angle should you throw a ball on a flat field in order to get
the maximum range?
It depends on the initial speed
Ralph asked me a question the other day
about a ball that is thrown upwards at an angle. Ralph thought that since the
ball is still moving upwards for a while after it is thrown, it must have some
upwards acceleration in the air after it leaves my hand that continues to propel the ball. I told him
"No, that's not quite what is happening." Can you help Ralph understand what
The comments in the next next two boxes go into a big, mostly anonymous text
file that I skim through before the morning lecture, using the comments to help
me plan class discussion. ("Mostly anonymous", because I can track down who made
what comment, but it takes some effort on my part to do so.) Therefore, if you
really want to make sure I see your question/comment and answer it individually,
you should send it to me via email and not through this form.
Which part of today's assignment was particularly hard or confusing? What
would you like to spend extra time on in class?
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