test practice

Test is next week.  Here are some practice problems.

1.  Consider a ball dropped from rest.  It reaches a top speed of 36 m/s.

a.  From what height was it dropped?
b.  How much time did it spend in air?
c.  Draw 3 related graphs:  d vs. t, v vs. t, a vs. t.

2.  Consider a ping pong ball gun that shoots a ping pong ball horizontally at 10 m/s.  It is mounted on a desktop, 1.2-m above the floor.  Where (horizontally) should you place a cup to catch the ball?

3.  A soccer ball is kicked at a 20-degree angle, with an initial speed of 15 m/s.

a.  How far will it travel (horizontally)?
b.  How long will it be in air?
c.  How high (max) will it rise above the ground?
d.  What is the other angle that would yield the same range?

4.  Review these ideas:

a.  SI standards - what they are, what they were, why was there a change?  You don't need to know specific numbers, but rather things like:  the meter is now based on the speed of light, though it was once based on the distance between north pole and equator.

b.  Unit conversions

c.  Odd numbers rule (Galileo)

d.  The weirder problems (drowsy cat, problems with quadratics)

e.  Difference between distance and displacement, speed and velocity

f.  How to use all equations of motion

g.  How and when to use horizontal and vertical components of motion

h.  The related demonstrations (ballistics cart, etc.)