Ch7

1
Chapter 7
2
A particle moves cw around a circle at constant
speed for 2.0 s. It then reverses direction and
moves ccw at half the original speed until it has
traveled through the same angle. Which is the
particles angle-versus-time graph?
(1) (2) (3) (4)
3
A particle moves cw around a circle at constant
speed for 2.0 s. It then reverses direction and
moves ccw at half the original speed until it has
traveled through the same angle. Which is the
particles angle-versus-time graph?
(3) (4)
(1)
(2)
4
Rank in order, from largest to smallest, the
centripetal accelerations (ar)ato (ar)e of
particles a to e.
1. (ar)b gt (ar)e gt (ar)a gt (ar)d gt (ar)c 2.
(ar)b (ar)e gt (ar)a (ar)c gt (ar)d 3. (ar)b gt
(ar)a (ar)c (ar)e gt (ar)d 4. (ar)b gt (ar)a
(ar)a gt (ar)e gt (ar)d 5. (ar)b gt (ar)e gt (ar)a
(ar)c gt (ar)d
5
Rank in order, from largest to smallest, the
centripetal accelerations (ar)ato (ar)e of
particles a to e.
1. (ar)b gt (ar)e gt (ar)a gt (ar)d gt (ar)c 2.
(ar)b (ar)e gt (ar)a (ar)c gt (ar)d 3. (ar)b gt
(ar)a (ar)c (ar)e gt (ar)d 4. (ar)b gt (ar)a
(ar)a gt (ar)e gt (ar)d 5. (ar)b gt (ar)e gt (ar)a
(ar)c gt (ar)d
6
A block on a string spins in a horizontal circle
on a frictionless table. Rank order, from largest
to smallest, the tensions Ta to Te acting on
blocks a to e.
1. Tb gt Ta gt Td gt Tc gt Te 2. Td gt Tb Te gt Tc
gt Ta 3. Te gt Tc Td gt Ta Tb 4. Te gt Td gt Tc
gt Tb gt Ta 5. Td gt Tb gt Te gt Tc gt Ta
7
A block on a string spins in a horizontal circle
on a frictionless table. Rank order, from largest
to smallest, the tensions Ta to Te acting on
blocks a to e.
1. Tb gt Ta gt Td gt Tc gt Te 2. Td gt Tb Te gt Tc
gt Ta 3. Te gt Tc Td gt Ta Tb 4. Te gt Td gt Tc
gt Tb gt Ta 5. Td gt Tb gt Te gt Tc gt Ta
8
A car is rolling over the top of a hill at speed
v. At this instant,
1. n gt w. 2. n w. 3. n lt w. 4. We cant tell
about n without knowing v.
9
A car is rolling over the top of a hill at speed
v. At this instant,
1. n gt w. 2. n w. 3. n lt w. 4. We cant tell
about n without knowing v.
10
A ball on a string is swung in a vertical circle.
The string happens to break when it is parallel
to the ground and the ball is moving up. Which
trajectory does the ball follow?

1. a
2. b
3. c
4. d

11
A ball on a string is swung in a vertical circle.
The string happens to break when it is parallel
to the ground and the ball is moving up. Which
trajectory does the ball follow?

1. a
2. b
3. c
4. d

12
Chapter 7 Reading Quiz
13
Circular motion is best analyzed in a coordinate
system with
1. x- and y-axes. 2. x-, y-, and z-axes. 3.
x- and z-axes. 4. r-, t-, and z-axes.
14
Circular motion is best analyzed in a coordinate
system with
1. x- and y-axes. 2. x-, y-, and z-axes. 3.
x- and z-axes. 4. r-, t-, and z-axes.
15
The quantity with the symbol w is called
1. the circular weight. 2. the angular
velocity. 3. the circular velocity. 4. the
centripetal acceleration.
16
The quantity with the symbol w is called
1. the circular weight. 2. the angular
velocity. 3. the circular velocity. 4. the
centripetal acceleration.
17
For uniform circular motion, the net force
1. points toward the center of the circle. 2.
points toward the outside of the circle. 3. is
tangent to the circle. 4. is zero.
18
For uniform circular motion, the net force
1. points toward the center of the circle. 2.
points toward the outside of the circle. 3. is
tangent to the circle. 4. is zero.