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Review Sheet for Physics 141 Exam #2
Chapter 6: Projectile motion
•
Figure out what the acceleration is in the x and y directions. You may need a freebody
diagram to figure this out. F
netx
= ma
x
=
Σ
f
xi
and F
nety
= ma
y
=
Σ
f
yi
.
•
Use kinematics in both the x and y directions. Generally one direction will help you solve for
something that you need in the other direction. (problems 5,11,28,35,40)
Chapter 7:
Rotations
•
θ
(rad),
ω
(rad/s),
α
(rad/s
2
) are the rotational variables. In chapter 6,
α
is always zero!
(4,8,12)
•
Revolutions per minute (rpm) need to be converted to rad/s = (rev/min)*(2
π
/rev)*(60s/min).
•
Position around the circumference (s=
θ
r in meters), tangential velocity (v
t
=
ω
r in m/s), and
radial acceleration, (a
r
=
ω
2
r = v
t
2
/r in m/s
2
). (17,20,28)
•
Be able to use a
r
in F
net
=ma
r
=
Σ
f
ri
situations. (36,50,51, Quiz#4)
•
The rotational kinematic equations help you move around the circle. Again, in chapter 6,
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 Spring '06
 staff
 Physics, Acceleration, Projectile Motion

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