Uniform Circular Motion
This article contains the complete lesson plan of the topic Uniform Circular Motion of Class 8th of CBSE boards following NCERT books.
- To develop interest of students in physical science.
- To develop an inquiry spirit in the students.
- To help students to see the physical science in relation to the rest of the culture.
- To develop interest in questioning.
- To develop critical thinking and scientific attitude.
- To develop supervisory ability in students.
- To develop problem solving skills in students.
- To make the students aware about inventions in the field of physical science and acquaint them with the knowledge of different streams of physical science.
- Students will be able to define uniform circular motion.
- Students will be able to explain the motion of a particle moving in uniform circular motion.
- Students will be able to give examples of uniform circular motion.
Chart, Roller board, pointer and other useful classroom equipments.
Students are already aware about motion and its types.
|Q1. Name different types of motion.||Circular, periodic, rectilinear|
|Q2. What kind of motion does merry go round shows?||Circular motion|
|Q3. What will we call a circular motion that moves with constant speed?||Uniform Circular Motion|
STATEMENT OF AIM
So, today we are going to study the topic ‘Uniform Circular Motion’.
TEACHING POINT 1: Definition of Uniform Circular Motion
The motion of a body moving with constant speed along a circular path is called uniform circular motion.
Here, the speed is constant but the velocity changes.
TEACHING POINT 2: Particle moving in a Uniform Circular Motion
- If a particle is moving in a circle, it must have some acceleration acting towards centre which is making it move around the centre.
- Since, this acceleration is perpendicular to the velocity of a particle at every instant it is only changing the direction of velocity and not magnitude. That’s why the motion is called uniform circular motion.
- This acceleration is called as centripetal acceleration (or radial acceleration) and the force acting towards centre is called centripetal force.
- If a particle is moving in a uniform circular motion:
- Its speed is constant.
- Its velocity is changing at every instant.
- There is no tangential acceleration.
- Radial acceleration = ω2r
TEACHING POINT 3: Examples of Uniform Circular Motion
Some examples of uniform circular motion are:
- Motion of artificial satellite around the earth.
- The motion of electrons around its nucleus.
- The motion of blades of the windmills.
- The tip second’s hand of a watch with circular dial shows uniform circular motion.
- Speed of a body remains constant in uniform circular motion.
- Velocity of body with uniform circular motion changes.
- A particle moving in uniform circular motion must have some acceleration acting towards centre.
- Only direction of velocity changes, magnitude remains constant.
- The force acting towards centre is called as centripetal force.
- Some examples of uniform circular motion are artificial satellite, motion of electron around nucleus etc.
Pupil-teacher will supervise the problem of the students and solve it.
Q1. In uniform circular motion __________ remains constant.
Q2. _________ changes at every instant in uniform circular motion.
Q3. Speed of body moving in uniform circular motion is constant. (True/False)
Q4. Tangential acceleration is present in a particle moving with uniform circular motion. (True/False)
Q5. Give an example of uniform circular motion.
Q. Define uniform circular motion. Give some examples of uniform circular motion.
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