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# Homework Problems Physics 131: Section 4

last edited by 1 year, 8 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 {*}

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.

2. Molly on the skateboard {*

3.

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.

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

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 {*}

4.
5. The nature of Hooke's Law

### 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

2. With a grain of salt {*}

3. Electric field hockey (PhET) {*}

4. Analyzing dipoles {*}

5.

6.

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.

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.

### 4.3.1 Linear momentum

Problem name  Type  Features  Threads  Use

2. Break a leg (Not!) {*}

3.

(2 versions)

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

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