1. Regular Physics Chapter 4 Concept Development Page 11-16
Created for CVCA Physics By
Dick Heckathorn
19 October 2K+4

2. Table of Contents CD 3 Statics p-11 6 Vectors & Equilibrium p-12
11 Force and Velocity Vectors p-13
14 Vectors and Equilibrium p-14
19 Force and Velocity Vectors p-15
22 Net Force p-16

3. 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

4. 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.
What is the path of the rock when the string breaks? A B C C D
CD p11

5. 3. The bus is traveling at 100 km/h. Its horizontal velocity is
Relative to the bus, the pencil is traveling at…
100 km/h.
As it drops, its horizontal velocity is
0 km/h.
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 dropped.
CD p11

6. 4. The force due to gravity on an object is called? weight
The quantity of matter in an object is called?
mass
The amount of space an object occupies is called?
volume
CD p12

7. 5. The force due to gravity on 1-kg is w = mg
The mass with a weight of 98 N is
10 kg
CD p12

8. Find ‘g’ on moon
Click to show video clip of dropping hammer on the moon.
Determine ‘t’ and ‘d’ and then find ‘g’ using d = ½ gt2.
Click

9. 6. Find the weight of your physics book. Then complete the table.
Object
Mass
Weight
Melon
1 kg
_____
Apple
______
1 N
Physics Book
Uncle Harry
90 kg
9.8 N
0.1 kg
882 N
CD p12

10. 7. Hit lead plate with hammer
CD p12

11. 300
300
150
300
CD p13

12. 150
300
No!!!
100
150
300
No!!!
CD p13

13. 500
830
1000
CD p13

14. 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

15. 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

16. 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

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

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

19. Force
Vectors
CD p15

20. Force Vectors Velocity Vectors
CD p15

21. The forces on the ball are?
CD p15

22. 4
Fnet = 4
Fnet = 1 3 4
CD p16

23. 4 4 3
Fnet = 5
Fnet = 5 3 4 2 4 2 5 3 3
Fnet = 5
Fnet = 5 5
CD p16

24. 9.9
9.9 7
CD p16

25. That’s all folks!