# Already graded

# Warm-Up Exercise for lecture 3

## Due 8:00 am, Tues, Sep 8

Physics 105, Fall 2009

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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.)

☐ yes
☐ no

T/F: It doesn't matter which order you add two vectors together, you will get
the same sum either way.

☐ true

☐ false

Which geometrical shape does the path
of a 2D
projectile follow?

☐ line

☐ circle

☐ ellipse

☐ parabola

☐ hyperbola

A man on a treadmill is walking at
1.5 m/s to the left. The treadmill is going at 2 m/s to the right. If you are
standing still, it looks like the man is moving:

☐ 0.5 m/s left

☐ 3.5 m/s left

☐ stationary

☐ 0.5 m/s right

☐ 3.5 m/s right

Ralph is confused about how his book defined the components of a vector. The
book says, "The components of a vector are the projections of the vector along
the coordinate axes". What can you tell Ralph to help him understand what the
word "projections"
means in this context?

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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