A coin with a diameter of 2.40 cm is dropped on
edge onto a horizontal surface. The coin starts out
with an initial angular speed of 18.0 rad/s and rolls
in a straight line without slipping. If the rotation
slows with an angular acceleration of magnitude
1.90 rad/s2, how far does the coin roll before
coming to rest?
Which equation should we use?
Quiz 3
Which figure shows the correct direction of the
centripetal acceleration (fat arrow)?
A.
B.
C.
D.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 2
What is the distance traveled by the coin?
A.
B.
C.
D.
A. ω = ωi + αt
B. ∆θ = ωi + (1/2)αt2
C. ω2 = ωi2 + 2α∆θ
Figure 1
A coin with a diameter of 2.40 cm is dropped on
edge onto a horizontal surface. The coin starts out
with an initial angular speed of 18.0 rad/s and rolls
in a straight line without slipping. If the rotation
slows with an angular acceleration of magnitude
1.90 rad/s2, how far does the coin roll before
coming to rest?
Figure 3
Figure 4
1.02 m
4.08 m
2.04 m
0.51 m
Quiz 4
Which way would the friction point if the car were
going slower than v?
Figure 1
A.
B.
C.
D.
Figure 2
Figure 3
Figure 4
Figure 1
Figure 2
Figure 3
Figure 4
1