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Homework Problems Physics 131: Section 4

Page history last edited by Joe Redish 1 year, 4 months ago

NEXUS/Physics > InstructorsHomePage > The Problem Collection > Homework Problems Physics 131

 

Homework Problems:

 

Interpretation of Problem Classification Icons 

 

 

 

4. Dynamics: Laws of motion

4.1.1 Physical content of Newton's Laws

Problem name  Type  Features  Threads  Use 
1. Hitting a bowling ball {*}  
 

2. The sliding pizza {*}

 
3. Forces in a car {*}
       
4. Cart on a ramp (LoggerPro) {*}
       
5. Comfort with forces
   
6. Forces on a swimming paramecium (MC) {*}      
7. A remote controlled car {*}        
         
         

4.1.2 Formulation of Newton's Laws as foothold principles 

Problem name  Type  Features  Threads  Use 
1. Kicking a car {*} 
     
2. Molly on the skateboard {* 

 

     
3.  Crawling amoebas {*}
     
 
4. The stooping hawk {*}

 

 
     
5. Pushing a carriage {*}
     
6. The book and the wall {*}
     
7. The farmer and the donkey {*}
   
8. Force on a woodpecker {*}
   

 

9. Trap-jaw ants {*} 
       
10. Pushing a box {*}    
11. Pushing two boxes {*}        
12. The Limits of Object Egotism     
13. The diving gannet  {*        
14. Splitting the concept of force       

15. Pushing a box - the details {*}

       
16. Conditions for Newton 3         
17. Why bother with Newton 1?       
      Pushing a block on a block - overview          
18. Pushing a block on a block - qualitative {*}        
19. Pushing a block on a block - symbols {*        
20. Nathan's train {*}        
21. Riding an elevator {*}        
22. Drawing consistent graphs {*}        
23. Toy models and Newton's Laws          
24. The ball and the juggler (D) {*}   (also 3.2.2.P10)       
25. Son of the ball and the juggler {*        
26. Space jam {*        

4.2.1 Spring forces

Problem name  Type  Features  Threads  Use 
1. Atomic force microscope 
 
   

2. The spring of DNA -- FBD {*}
 
     

3. Hooke's law vs DNA {*}

   
   
4. Stretching two springs {*}    
5. The nature of Hooke's Law      

6. Stretching multiple springs - toy model of a muscle {*}

6A. Stretching multiple springs - toy model of a normal force {*}

   
         
         

4.2.2 Resistive forces

Problem name  Type  Features  Threads  Use 
1. Propelling a paramecium Part 1: Equations {*}        
2. Propelling a paramecium Part 2: Estimations {*}        
3. Propelling a paramecium  Part 3: Calculations (Excel)        
4. The flying squirrel and the water flea {*}
4a. The flying squirrel and the water flea (ext) 
       
5. Propelling a paramecium: Overview {*}        
6. Pushing a block on a block - quantitative  {*}        
7. Falling coffee filters {*        
8. Ball falling in oil {*}        
9. Krakatoa         

4.2.3 Gravitational force

Problem name  Type  Features  Threads  Use 
1. Comparing a light and a heavy object        (2 versions)
 
2. Free-fall acceleration {*}    
3. Rolling up and down {*} (also 3.1.4.P5)      
4. Balls up! {*}        
5. Are you OK to drive? {*}        
6. The faster fall {*}        
7.        
8.        
9.        

4.2.4 Electric forces

Problem name  Type  Features  Threads  Use 

1. Forces between charges {*}

   
2. With a grain of salt {*}
 
   
3. Electric field hockey (PhET) {*}  
       
4. Analyzing dipoles {*}
 
     
5. Counting charges {*} 
     
6. The content in Coulomb's law {*} 
   
7. Water coat forces {*} 
 

    
8. Estimating charge {*}
   
8a. Estimating the charge on DNA {*}
   
 
8b. But it's just a leetle bit different  {*}      
9. PIP2 cluster stability {*}
     
10. Hydrogen bonding I
       
11. Effect of molecular shape on electric forces {*}
       
12. Molecular E-forces  
 
13. Three-charge problems       
14. Oil-water electric forces I  {*}         
15. The Millikan oil drop experiment (also 8.2.P5)          
16. Repelling pith balls  {*}        
17. Electric forces on charges {*}        
18. Forces between a charge and a dipole {*}        
19. Forces between dipoles {*}        
20. Charge in the CGS system        
21. Force between a charge and a dipole        
22.        
23.        

4.3. Coherent vs. random motion

4.3.1 Linear momentum

Problem name  Type  Features  Threads  Use 

1. Taking Cyrano to the moon {*}

     
2. Break a leg (Not!) {*}
     
3. Momentum conservation in subsystems {*}
     

4, Molecular collisions: 1 {*}

   
 

5. Molecular collisions 2 {*}

     (2 versions)

6. Molecular collisions 3

     
 
7. Carts and graphs {*}      
8. Colliding carts {*}      
9. Hitting the wall       
  
10. Closing the door {*}        
11. When is momentum conserved? {*        
         

4.3.2 The role of randomness

Problem name  Type  Features  Threads  Use 
1. Random vs coherent motion        
2. Random or not, here I come         
2A. Random or not, here I come (MC version) {*}      
3. How many ions? (also 2.1.4.P13) {*}    
4. Analyzing tradeoffs in mechanisms for moving       
         
         
         

4.3.3 Diffusion and random walks

Problem name  Type  Features  Threads  Use 
1. Diffusion in time and space
   
 
1A. >Diffusion in time and space {*}
   
2. Diffusion and viscosity {*}
 
3. Cell polarization and activation
   
4. Diffusion and slime molds {*}
     
5. Random vs coherent motion (Listeria)
     
6. Growing root tips
       
7. Jittery cells
8. Diffusion in capillaries {*}  
9. Relay cells
       

10. Molarity and number density {*}

       

11. Molarity and diffusion

     

12. Molarity, density, and diffusion {*}

     
13. Signaling across a synapse        
14. Diffusion down an axon        
15. Diffusion through an ion channel {*}       
16. The Diffusion Spread Equation {*        

 

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