1. Paper River Investigation
Chapter 3
Honors Physics by
Dick Heckathorn

2. Measurement 1
Speed of Stomper Car

3. Measurement 2
Speed of River

4. Measurement 3
Width of river

5. Prediction 1
Speed of Car Going Downstream

6. Prediction 2
Speed of Car Going Upstream

7. Prediction 3 Groundspeed when heading across the river
Direction when heading across the river

8. Prediction 4
Direction to head to go directly across

9. Prediction 5
Time to cross if no current

10. Prediction 6
Time to cross when heading across
(Current)

11. Prediction 7
Time to cross when going across
(Current)

12. Measurement 4 Ground speed when heading across the river
Direction when heading across the river

13. Measurement 5
Direction to head to go directly across

14. Measurement 6
Time to cross if no current

15. Measurement 7
Time to cross when heading across
(Current)

16. Measurement 7
Time to cross when going across
(Current)

17. Quiz Question 1
A boat heads directly across a river 41 m wide at 3.8 m/s. The current is 2.2 m/s.
a. What is resultant velocity of the boat?
b. How long to cross the river?
c. How far downstream is boat when it reaches the other side?

18. a. 4.39 m/s across 30.1o downstream b. 10.8 sec c. 23.7 m
Quiz Question 1 Answers
a m/s
across 30.1o downstream
b sec
c m

19. Quiz Question 2
A boat heads directly across a river 110 m wide at 8.5 m/s. The current is 3.8 m/s.
a. What is resultant velocity of the boat?
b. How long to cross the river?
c. How far downstream is boat when it reaches the other side?

20. a. 9.31 m/s across 30.1o downstream b. 12.9 sec c. 49.2 m
Quiz Question 2 Answers
a m/s
across 30.1o downstream
b sec
c m