1. Honors Physics Specials
Created for CVCA Physics By
Dick Heckathorn
27 October 2K + 4

2. Table of Contents 03 Conc. Dev. 4.1 Inertia p11
07 Conc. Dev Friction p17
12 Conc. Dev Statics p13
16 Conc. Dev Vectors and Equilibrium
22 N.T.Q. Holding Block to Wall
26 Conc. Dev Net Force p16

3. Concept Development
4.1 Inertia
Page 11

4. The rock’s tendency to do this is called…
1. An astronaut in outer space away from all forces throws a rock. What will happen to the rock?
inertia.
What is inertia?
How is it measured?
grams /kg.
CD p11

5. What is the path of the rock when the string breaks?
2. The rock is being whirled at the end of a string in a clockwise rotation as seen from above.
What is the path of the rock when the string breaks? A B C C D
CD p11

6. 3. The bus is traveling at 100 km/h.
Relative to the bus, the pencil is traveling at…
0 km/h.
As the pencil drops, its horizontal velocity is
100 km/h.
Where will the pencil strike the floor?
Where will the pencil strike the floor if the bus is at rest?
Directly below where dropped.
Directly below where it is dropped.
CD p11

7. Concept Development
5.1 Friction
Page 17

8. Fg on crate
Crate is at rest.
Fe on crate
CD 5.1
p17

9. Fe on crate Fg on crate FP on crate Fg on crate Crate is at rest.
CD 5.1
p17

10. Fe on crate Fg on crate Fg on crate FP on crate Crate is speeding up.
CD 5.1
p17

11. Fe on crate Fg on crate Fg on crate FP on crate
Crate is moving at constant v.
Fe on crate
CD 5.1
p17

12. Concept Development
4.2 Statics
Page 13

13. 300
300
150
300
CD p13

14. 150
300
No!!!
100
150
300
No!!!
CD p13

15. 500
830
1000
CD p13

16. 4.2 Vectors and Equilibrium Page 14
Concept Development
4.2 Vectors and Equilibrium
Page 14

17. T Fs on r W Fe on r The rock hangs at rest.
The net force on the rock is…
What force(s) act on it?
How do they compare?
Zero. W
Fe on r
CD p14
CD p14

18. E W Fe on r B A FA on r FB on r The rock is suspended by two strings.
There is a tension in each string.
FA on r
FB on r
How big is each tension? W
Fe on r
The net force is …
CD p14

19. E W Fe on r A B What is different here? The angles are different.
Find the magnitude of A and B. B W
Fe on r
CD p14

20. E B A
The tension is greater in A or B? W
Fe on r
CD p14

21. A B
Fe on r B A
Fe on r A B
Fe on r
CD p14
CD p14

22. Next Time Question
4.3 Holding Book to Wall

23. No Friction
Find Components
Push Up with
Specific Force

24. Friction Up
Push Up with
Less Force

25. Friction
Down
Push Up with
Greater Force

26. Concept Development
4.3 Net Force
Page 16

27. 4
Fnet = 4
Fnet = 1 3 4
CD p16

28. 4 4 3
Fnet = 5
Fnet = 5 3 4 2 4 2 5 3 3
Fnet = 5
Fnet = 5 5
CD p16

29. 9.9
9.9 7
CD p16