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

Table of Contents 03 Conc. Dev. 4.1 Inertia p11 07 Conc. Dev. 5.1 Friction p17 12 Conc. Dev. 4.2 Statics p13 16 Conc. Dev. 4.2 Vectors and Equilibrium 22 N.T.Q. Holding Block to Wall 26 Conc. Dev. 4.3 Net Force p16

Concept Development 4.1 Inertia Page 11

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

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

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

Concept Development 5.1 Friction Page 17

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

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

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

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

Concept Development 4.2 Statics Page 13

300 300 150 300 CD p13

150 300 No!!! 100 150 300 No!!! CD p13

500 830 1000 CD p13

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

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

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

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

A B Fe on r B A Fe on r A B Fe on r CD p14 CD p14

Next Time Question 4.3 Holding Book to Wall

No Friction Find Components Push Up with Specific Force

Friction Up Push Up with Less Force

Friction Down Push Up with Greater Force

Concept Development 4.3 Net Force Page 16

4 Fnet = 4 Fnet = 1 3 4 CD p16

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

9.9 9.9 7 CD p16