CBSE Class 9 Force and Laws Of Motion

Scroll down for PDF

CBSE Class 9 Force & Laws Of Motion. Learning the important concepts is very important for every student to get better marks in examinations. The concepts should be clear which will help in faster learning. The attached concepts made as per NCERT and CBSE pattern will help the student to understand the chapter and score better marks in the examinations.

Chapter–9 

"Force & Laws Of Motion''

1 Balanced and Unbalanced Forces

Balanced Forces The net force is when two or more forces are applied on the same object and at the same time. The applied forces combined are called the net force. = 0 25 N 25 N Balanced Forces The force I apply in one direction plus the force you apply in the opposite direction are added together. 25 N -25 N = 0 Because the forces are equal and balanced…just like a balanced scale…this is an example of balanced forces. Unbalanced Forces What does it mean to have something unbalanced? Unequal, not the same, different How could we have unbalanced forces?

class_9_science_concept_13

Unbalanced Forces A force is applied in one direction and either another smaller or larger force is applied in the opposite direction or no force is applied at all in the opposite direction.

Unbalanced Forces  if i have chair and i puch on one side  of it with a force of 50 N and you push on the other side, with a force of 25 N, will the chair move? Which way will it move? The direction in which the most force is applied. What is the net force? 50 N 25 N. Unbalanced Forces 50N -25N = 25N These forces are unequal so the forces are considered unbalanced forces. 50 N 25 N = 25 N Unbalanced Forces If I push the chair in one direction with 25 N force and you push the chair in same direction with 25 N force, will the chair move? Why? Because the applied net force is UNBALANCED! Unbalanced Forces 25 N 25 N = 50 N The result would be the chair moving in the direction it was pushed with a combined force of 50 N.

Test Yourself

1. An object of 5 kg is acted upon by two forces, 70 N each in opposite directions. What is its acceleration?

2. Why does an object accelerate during free fall?

2 Laws of Motion

Newton's First Law 1st Law – An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity, unless acted upon by an unbalanced force. An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity, unless acted upon by an unbalanced force.

Newton's Second Law "If the net force on an object is not zero, the object will accelerate. The direction of the acceleration is the same as the direction of the net force. The magnitude of the acceleration is directly proportional to the net force applied, and inversely proportional to the mass of the object."

Mathematical symbols provide a convenient shorthand for all of this:

a=Fnet/m or Fnet=ma 

Please click the link below to download pdf file for CBSE Class 9 Force & Laws Of Motion.

Tags: 


Click on the text For more study material for Science please click here - Science

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

Noida School to Shut For 3 Days Coronavirus Detected

Some of the schools in Noida have decided to shut for 3 Days because father of two students in Noida was traced to be infected with the contagious Coronavirus. The internal exams have also been cancelled in those schools after the virus alarm. A 45 year old male who is...

CBSE Board examination 2020 Admit card

The admit card for CBSE 10th & 12th 2020 has been released online by the CBSE Board at cbse.nic.in. The admit card is available to private as well as regular students. Private applicants may access the CBSE admit card 2020 by submitting their application number,...

Delhi Government orders closure of all Primary Schools

Delhi Government orders closure of all Primary Schools till 31stMarch due to the CORONAVIRUS A much needed announcement by the Government of Delhi. On Thursday, the Delhi Government instructed all the schools of the state to close operations for the students of Pre-...

CBSE chairman Anita karwal wrote a motivational letter to board candidates

CBSE chairman Anita karwal wrote a motivational letter to board candidates before the CBSE board Exam The CBSE (Central Board of Secondary Education) class 10th and 12th board exams are starting from 15 February 2020. Not only the students, their parents are also tense...

All Delhi Schools to Adopt DIGITAL Attendance Methods

The Delhi Government takes another step ahead towards Digitalization of the Education Sector by proposing digital attendance in all Delhi Government Schools. As part of the Zero Paperwork Programme the attendance in all Delhi government school to be noted on e-tablets...

CBSE Exam centre locator Mobile App

The CBSE board examinations will start from 15 February 2020. The CBSE Board issued admit cards, and all schools start distributing copies of the admit cards. All students should read their admit card details correctly. CBSE admit card details the examination centre,...

×
Studies Today