Lesson Notes By Weeks and Term - Junior Secondary 1
Forces
Forces
TERM – 3RD TERM
WEEK THREE
Class: Junior Secondary School 1
Age: 12 years
Duration: 40 minutes of 5 periods each
Date:
Subject: BASIC SCIENCE
Topic: FORCES
SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to
INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers,demonstration, videos from source
INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,
INSTRUCTIONAL PROCEDURES
PERIOD 1-2
|
PRESENTATION |
TEACHER’S ACTIVITY |
STUDENT’S ACTIVITY |
|
STEP 1 INTRODUCTION |
The teacher explains the meaning of force and identify the types of forces. |
Students pay attention |
|
STEP 2 EXPLANATION |
Teacher describe contact and non contact forces. |
Students pay attention and participate |
|
STEP 3 DEMONSTRATION |
Teacher discusses the magnetic and gravitational force. |
Students pay attention and participate |
|
STEP 4 NOTE TAKING |
The teacher writes a summarized note on the board |
The students copy the note in their books |
NOTE
FORCES
Forces are interactions that cause an object to accelerate or change its state of motion. They can push, pull, or twist objects, and they are characterized by their magnitude, direction, and point of application. Forces are fundamental in physics and are described using Newton's laws of motion.
Types of Forces
Contact forces are interactions between objects that occur when the objects physically touch each other. These forces arise due to direct contact between the surfaces of the interacting objects. Examples of contact forces include:
- Normal Force: This force acts perpendicular to the surface of an object when it is in contact with a surface.
- Frictional Force: Friction opposes the motion of objects in contact with each other.
- Tension Force: This force occurs when an object is pulled by a rope, cable, or chain. It acts along the length of the connector and is directed away from the object.
Non-contact forces are interactions between objects that occur without direct physical contact between the objects. These forces act at a distance through fields or other mechanisms. Examples of non-contact forces include:
- Gravitational Force: The force of attraction between two masses. It is responsible for objects falling to the ground and the motion of celestial bodies.
- Electromagnetic Force: This force is associated with charged particles and magnetic fields. It includes forces like electrostatic attraction/repulsion and magnetic attraction/repulsion.
- Nuclear Forces: These forces hold atomic nuclei together. They include the strong nuclear force and the weak nuclear force.
Magnetic and Gravitational Force
Magnetic Force
Magnetic force is a fundamental force that acts between magnetic objects. It arises from the interaction of moving electric charges, such as electrons, within magnetic fields. When magnetic objects, such as magnets or magnetic materials, are brought near each other, they experience either attraction or repulsion depending on the orientation of their magnetic fields. The strength of the magnetic force depends on factors such as the distance between the objects and the magnitude of their magnetic fields.
Gravitational Force
Gravitational force is the force of attraction between objects with mass. It is one of the fundamental forces of nature and is responsible for phenomena such as the motion of celestial bodies, the formation of galaxies, and the behavior of objects on Earth's surface. Gravitational force is always attractive, meaning it pulls objects toward each other. On Earth, gravitational force is responsible for objects falling to the ground and for keeping celestial bodies in orbit around each other.
EVALUATION: 1. Define force.
CLASSWORK: As in evaluation
CONCLUSION: The teacher commends the students positively