# Module 3: Chapter 3: Force, Work, and Power Assignment

**Opened:**Friday, October 27, 2023, 12:17 AM

##### Chapter 3: Work, Force, and Power Assignment (worth 10 points maximum)

**This assignment aligns with the following Module 3: Chapter 3: Force, Work, and Power objectives:**

- Explain and apply Newton's first, second, and third laws. (CLO1)(CLO2)(CLO3)
- Identify various forces in a diagram or problem (CL02) (CL03)
- Translate a free-body diagram into a mathematical representation. (CLO2)(CLO5)
- Calculate mass, weight, and force (CLO2)(CLO5)
- Explain what is meant by normal force. (CLO2)(CLO3)
- Explain the role that inertial plays in effecting motion (CLO2)(CLO3)
- Discuss the requirements for and consequences of balanced and unbalanced forces(CLO2) (CLO3)
- Calculate the net force acting on objects and their resulting accelerations. (CLO2)(CLO5)
- Identify action-reaction pairs (CLO2)(CLO3)
- Define and calculate work using appropriate SI units (CLO2)(CLO3)(CLO5)
- Define and calculate power based on work and time. (CLO2)(CLO3)(CLO5)

**Part A - Balanced and Unbalanced Forces**

- Which object has more inertia – a bowling ball or a tennis ball? Explain. How does inertia influence your ability to roll a bowling ball versus a tennis ball? Explain.
- Write Newton’s First Law of Motion in your own words. You MAY NOT use the following words: at rest, motion, constant velocity, net force.
- Use Newton’s First Law of Motion and the concept of inertia to explain what happens to a person in a head-on car accident who is not wearing a seat belt. How does wearing a seat belt help?

**Part B – Force Calculations**

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2. If a 70-kg swimmer pushes off a pool wall with a force of 250 N, what is her acceleration?

3. Find the mass of a football player who weighs 1250 N.

4. The mass of an object is 25kg. What is its weight?

**Part C – Read the following statements regarding the examples of the falling ****elephant and feather. Indicate whether each statement is True (T) or False (F).**

**Falling Objects without Air Resistance**

1. ____ The elephant has a greater weight and therefore falls faster.

2. ____ The elephant and the feather each have the same weight and therefore fall at the same rate.

3. ____ The elephant has both greater weight and greater inertia than the feather and therefore falls at the same rate as the feather.

**Part D- Work and Power**

- A game show contestant won a prize by pushing a bowling ball 20 m using her nose. The amount of work done was 1470 J. How much force did the contestant exert on the ball?
- Carlos does a chin-up in gym class and raises himself 0.8 m. If Carlos has a mass of 62 kg, how much work does he accomplish? If he completes this task in 5 seconds, how much power does he generate? (Remember, mass is not a force!)
- A football player picks up the football, runs with it, and throws it to a teammate. During which of these actions is work being done on the football? Explain.

*Please type your responses in a document. Save the document as a word, pdf, or g-doc and upload it using the file upload below.*