Prepared by: Gemima B. Galvez
I. Learning Objectives At the end of the lesson, 95% of the fourth year students should be able to: 1. define friction; 2. identify the types of friction; 3. draw the free body diagram of forces in a given problem; and 4. determine the advantages and disadvantages of frictional force in our daily life.
II. Learning Content A. Subject matter Friction 1. Content outline
Definition of terms
Types of friction
Construction of free-body diagrams
B. Science Concepts 1. Friction or frictional force (Ff or Ffr ) is the force between surfaces in contact that resist their relative motion. 2. Static friction is the type of friction that occurs between bodies in contact which is at rest. 3. Kinetic friction occurs between bodies in contact which is in sliding motion. 4. Rolling friction occurs between bodies in contact that are in rolling motion. 5. Weight is the force directed towards the center of the earth which is perpendicular to the horizontal ground or surface. 6. Applied force is the push or pull applied to any object. 7. Normal force is the force that equals the force of gravity to keep an object in the surface it is situated.
C. Science Process Skills 1. Observing 2. Identifying variables 3. Inferring 4. Analyzing
D. Value Focus 1. Perseverance 2. Hard work 3. Valuing life
E. References 1. Beiser, Arthur, Modern Technical Physics-6th Edition, Wesley Publishing Company,1997 2. Silverio, Angelina, Physics; Exploring Life Through Science-2nd Edition, Phoenix Publishing House Inc., 2011 3. Navasa, Delia, Fourth Year Physics, Phoenix Publishing House Inc., 2011
F. Teaching Aids 1. Catolina 2. Pentel Pen 3. Table
III. Teaching Methodology Teacher’s Activity | Students’ Activity | Time Frame | A.
References: 3. Navasa, Delia, Fourth Year Physics, Phoenix Publishing House Inc., 2011 F