Answers to Select Questions
From the Motion Strand

Latest Update Nov 7 2002

Chapter Nine Review Page 376

9. a) 24.0 m/s,      b) 5.0 m
11. a) 2.0 m/s,      b) 4.0 m/s,       c)Mark catches up to Bill 40 m from the start       d) At the end of 30 s, Mark is 20 m ahead of Bill
10. a) a graph,      b) slope or velocity is 2.0 m/s,       c) anwer will vary, ask for an evalution.
15. Riding the bus takes 25 min

Chapter Ten Section 10-3 Page 388

3. Car B has twice the acceleration of car A
4. Acceleration is 1.1 m/s2
5. The change in speed is 32 m/s
6. The acceleration of the blood is 5 m/s2
7. The average acceleration is 4.6 m/s2
10. The final speed is 4.9 m/s
11. The final speed is 53 m/s
12. The initial speed of the car is 10 m/s
13. The time for acceleration is 0.62 s
14. It takes the shuttle 22 s to stop.

Chapter 10 Review; Page 410

3.
  1. the object is not moving, it is at fixed distance from a starting point
  2. the object has a constant speed
  3. the object is accelerating
  4. the object has a constant speed
  5. the object has a constant acceleration
  6. the object has a constant acceleration
  7. the object has a non-uniform or changing acceleration
6. a) the speed (in m/s) between hydro towers is as follows; 7.5, 8.3, 7.5, 6.9, 7.5, 8.3, 7.5 with
      an average best line fit approximately 7.7 m/s
     b) since there is not acceleration you can use v = d/t, distance is 585.2 m or 0.59 km
      c) % error is about 1.5 %
7. 2.0 m/s
8. the car's change in speed is 4.5 m/s
9. the average acceleration is 8.8 (km/h)/min
10. The change in speed taked 50 s
11. The final speed is 1.5 m/s
12. The initial speed is 2.2 m/s
14. a) A graph, nice straight line,      The acceleration is 10 m/s2,       The distance traveled is 0.12 km

Chapter 11 Page 428

4. a)displacement is 5.8 x102 [N 59o E]      b)same answer as a),       same position,
      d) [S 59° W]
5. a) 104 m [N 81° E],       b) 6.2 km [N 60° E]

Chapter 11 Review; Page 442

4. a) position,       b) speed,      c) distance,       d) displacement,       e) velocity
8. a) section A uniform motion with a velocity of 1.7 m/s [E], section B no motion,
      section C uniform velocity -4.0 m/s [W]
      b) vector graph
      c) a position time graph indicates how change in position occurs over time, while a vector
      diagram only gives the change in position.

Chapter 12 ; Page 456

3 a) 16.5 m/s,      b) if west is positive +5.74 m/s, if east is positive -5.74 m/s or 5.74 m/s [W]
6. a) graph,     b) best line fit, hence acceleration will be constant,      c) 10.6 m/s [up],      d) 75 km/h [E]
10. a) the slope of a straight line,      b) slope of a tangent drawn to a curved line,
      c) just read off the v-axis,       d) just read off the v-axis

Chapter 12 Section 12-7 Page 476

5. The velocity of the sandbag is 20 m/s [down] or [S]
6. The velocity of the baseball is 39 m/s [down] or [S]

Chapter 12 Review; Page 486

1. a) Area under the line during the required time interval,       b) the slope of a velocity time graph,
      c) Total distance will be the sum of all areas per necessary intervals
6. 18 m/s,      b) a graph,      c) while braking acceleration is -1.6 m/s°,      d) 70 m [E]
7. a) V1 = 16.7 m/s [S] and V2 = 27.8 m/s [S]       b) 0.74 m/s [S],       c) 0.33 km [S]
8. a) The highest instantaneous velocity reached is 6.0 m/s       b) 2.5 s to stop,       c) graph,
      d) 36 M [N]       e) travels 90 m [N] at a constant velocity,
      f) After falling the displacement is 7.5 m [N],      
      g) Average velocity is 4.5 m/s [N]
9. a)Position at t = 9 is 0.,       b) instantaneous velocity at t = 5.o s is 1.0 m/s [N], at t = 7.0 s v = 0.0 m/s,
      and at t = 9.0 s v = 5.0 m/s [S],       c) is a graph

Unit Three Review; Page 490

3. a) distance,       b) velocity,       c) position,       d) acceleration,       e) displacement,       f) speed
5. a) distance,       b) speed,       c) displacement,       d) velocity,       e) velocity
8 a) 4 km/h,       b) 98 km/h
12. a) 25 km [W],       b) 64 km [N 57° E],       c) 61 km [N 74° W]
13 a) Travelling with her Dad requires 4.5 min and b) 7.7 min by bus and c) 6.8 min by bike
15. a) 15 m/s [N],       b) acceleration is 0.73 m/s2 [N],       c) displacement is 160 m [N],
      d) 1.3 m/s2 [S]
17. a) the displacement while reacting is 8.6 m [W]       b) displacement of the car is 1.8 x 102 m [W],       c) is a graph,
      d) before braking a = 0.0 m/s2 and while braking a = 2.5 m/s2 [E]
      Watch your vector directions on this
18. a) Initial speed is 13.8 m/s or 14 m/s,       b) 2.4 x 102m
19. a) is a graph,       b) Acceleration for the last 12 s is 0.75 m/s2 [S],
      c) displacement for the first 15 s is 83 m [N], for the next 25 s d = 230 m [N], and
      for the last 12 s 54 m [N] with a total displacement of 367 m [N].
      Note: depending upon round off you may not get this exact answer.