25 Learning Materials and Exercises
This is Amazing!
How many physics related concepts can you identify in this video?
Textbook Material to Read
Read:
Chapter 7 Work, Energy, and Energy Resources
7.1 Work: The Scientific Definition
7.2 Kinetic Energy and the Work-Energy Theorem
7.3 Gravitational Potential Energy
7.4 Conservative Forces and Potential Energy
7.8 Work, Energy, and Power in Humans
Energy and Metabolism
Energy comes in many different forms. Objects in motion do physical work, and kinetic energy is the energy of objects in motion. Objects that are not in motion may have the potential to do work, and thus, have potential energy. Molecules also have potential energy because breaking molecular bonds has the potential to release energy. Living cells depend on harvesting potential energy from molecular bonds to perform work.
For more information on connections of the topic with biological and health sciences read
Chapter 6 in OpenStax Biology textbook:
Problem-Solving Strategy: Work-Energy Theorem
- Draw a free-body diagram for each force on the object.
- Determine whether or not each force does work over the displacement in the diagram. Be sure to keep any positive or negative signs in the work done.
- Add up the total amount of work done by each force.
- Set this total work equal to the change in kinetic energy and solve for any unknown parameter.
- Check your answers. If the object is traveling at a constant speed or zero acceleration, the total work done should be zero and match the change in kinetic energy. If the total work is positive, the object must have sped up or increased kinetic energy. If the total work is negative, the object must have slowed down or decreased kinetic energy.
(Source: https://openstax.org/books/university-physics-volume-1/pages/7-3-work-energy-theorem )
Textbook Exercises
Solve the following problems.
Chapter 7
- Conceptual questions: 1 -5, 8, 11, 12, 17, 18, 21 – 24.
- Problems & Exercises: 1 -3, 9, 10, 12, 15, 17, 18, 27, 32, 38, 44, 53, 56.
Solving Problems in Physics
Note: Image by Chudaeva, E. (2022).
Formulas.
Modify this list as you wish to support your learning.
Elena’s explanation of how to approach and solve problems on work, energy, and power
Check this handout with problems and steps involved in solving these problems and thinking processes that Elena used to solve these problems.
Modify this handout as you wish to support your learning.
This is what you need to know to solve problems successfully
- Converting a number to scientific notation
- Converting units and metric system
- Counting significant figures
- Metric prefixes
- Determining number of significant figures in calculations
- Definitions of work and mechanical energy
- Rearranging formulas.
Application of Work: Ramps
Key Terms
Image credit: Hawgood, D. (2012). Wikimedia Commons. https://commons.wikimedia.org/wiki/File:Hotels_with_ramp_footway_to_elevated_tramway,_Sheffield_-_geograph.org.uk_-_2883131.jpg
Main idea
To Do
- Does a ramp reduce the amount of work?
- Does a ramp reduce force needed to move an object?
- Where do we use ramps in real life?
- A ramp is one of the simple machines that help people do the work. A ramp provides an advantage in force. It provides disadvantage in ____________. What is it?
