distance traveled along a path
Velocity
Position: usually x(t), or y(t) for motion along a line.
P1
average speed
medium
fast
slow
A
B
displacement:
s
C
average velocity:
D
E1
E2
On the Tour de France
1. Draw pictures and choose a direction for +
angles, rotations.
2. Can use units of rev/sec, deg/sec or rad/s if you
use them for each term in kin. eqns.
3. You must end up with units of radians if y
Exam 1 Solutions
1. B Using v f
2
= vo + 2ay you get v f = 2 gy Vf = 188 m/s
2
2. A - use y = v o t +
12
at
2
t = 19.2 s
3. A Distance traveled is equal to the total distance traveled or 3 times the
c
A From Newtons second law =
, we see that the acceleration of M is biggest, thus after accelerating
over a distance d it will be moving faster, from
=
+2
Exam 2 Solutions
1.
2. C By the work energy t
Exam 3 Solutions
1. F This is a conservation of momentum problem. Before she throws the snowball,
the total momentum of the system is 0, therefore, after she throws the snowball the total
momentum of
Exam 4 Solutions
1. A Both forces cause a torque in the same direction, so
as 2 fr = I so f =
= I
I
2r
We can find the angular acceleration using a kinematic
=
which we can rewrite
f o
t
= 12.5 rad
Exam 5 Solutions
1. C Here we use the Ideal gas law to make a ratio of the initial pressure and temperature to
the final pressure and temperature
P1 P2
=
T1 T2
but we must remember that this is the ab
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Constants: g = 9.8 m/s2 b
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