Test corrections Motion Test

Question 1

1. The speed on a speedometer is

Answer 1

Instantaneous speed

- notes U6C1 describing motion

Question 2

6. A softball pitcher throws a ball at 42 meters per second. If the batter is 18 meters from the pitcher, approximately how much time does it take for the ball to reach the batter

Answer 2

1. 9 s

- practice acceleration

Question 3

13. The horse on a carousel or merry-go-round are accelerating because

Answer 3

The direction of the horses are constantly changing

- notes - U6C2 acceleration

Question 4

15. Find the acceleration of a car that goes from 32 m/s to 96 m/s in 8.0 s.

Answer 4

4 m/s2

- notes - U6C2 Acceleration

Question 5

22. The graph at the right represents the motion of a car. According to the graph, as time increases, the speed of the car

Answer 5

Stays the same

- practice: motion graphs

Question 6

23. Ben is exercising his pony on a large, oval track. The pony is trotting at a constant speed of 10 m/s around the track. Which statement can be made about the pony’s motion?

Answer 6

The pony is accelerating

- notes - U6C2 Acceleration

Question 7

35. The space shuttle is flying at 2.0 km/hr and lands on the runway. It then slows down to 0.5 km/hr. If this takes 0.25hrs, what is your acceleration

Answer 7

Given- a = 2.0 - 0.5
Vi = 2.0km/hr ————-
Vf = 0.5km/hr 0.25
t ∂= 0.25hrs

Find- Acc = -6km/hr
Acc

Formula-
a = vf - vi
      ———
          t
Practice acceleration

Question 8

36. A car travels west for 240 km in 4 hr. What is the car’s velocity.

Answer 8

Given- 240/4
d = 240 km W
t= 4 hr 60 km/hr West

Find-
V

Formula-
V=D/t * s
Practice speed and velocity

Question 9

37. A person walks 3 mi North, turns, and walks 2 mi East. Calculate the person’s distance traveled and their displacement.

Answer 9

D = 5 mi
d = 3.60
- practice distance and displacement

Question 10

38. A boat is traveling at 43.2 km/hr. It then goes down a Forster part of the river and is now going 144 km/hr which gave the boat an acceleration of 25.2 km/hr2. How long did it take the boat to reach its new speed?

Answer 10

Given- 144
43.2 km/hr ——-
144 km/hr 25.2
25.2 km/hr2

Find- T = 5.64 s
Time

Formula-
s/acc
Practice speed and velocity

Question 11

39. A competitive go-cart driver is traveling 32 m/s. He sees a caution flag go up, so he slows at a rate of -1.5 m/s2 in 10.8 s, what is his final velocity?

Answer 11

Given- 32/ -1.5 * 10.8
32 m/s
-1.5 m/s2 V = 16.7
10.8 s

Find-
Vf

Formula-
s/acc * t
Practice speed and velocity