NCERT Class 9 Science Force And Laws Of Motion

Read and download NCERT Class 9 Science Force And Laws Of Motion in NCERT book for Class 9 Science. You can download latest NCERT eBooks chapter wise in PDF format free from Studiestoday.com. This Science textbook for Class 9 is designed by NCERT and is very useful for students. Please also refer to the NCERT solutions for Class 9 Science to understand the answers of the exercise questions given at the end of this chapter

NCERT Book for Class 9 Science Chapter 9 Force and Laws Of Motion

Class 9 Science students should refer to the following NCERT Book Chapter 9 Force and Laws Of Motion in Class 9. This NCERT Book for Class 9 Science will be very useful for exams and help you to score good marks

Chapter 9 Force and Laws Of Motion NCERT Book Class 9

FORCE AND LAWS OF MOTION

In the previous chapter, we described the motion of an object along a straight line in terms of its position, velocity and acceleration. We saw that such a motion can be uniform or non-uniform. We have not yet discovered what causes the motion. Why does the speed of an object change with time? Do all motions require a cause? If so, what is the nature of this cause? In this chapter we shall make an attempt to quench all such curiosities.

For many centuries, the problem of motion and its causes had puzzled scientists and philosophers. A ball on the ground, when given a small hit, does not move forever. Such observations suggest that rest is the “natural state” of an object. This remained the belief until Galileo Galilei and Isaac Newton developed an entirely different approach to understand motion.

In our everyday life we observe that some effort is required to put a stationary object into motion or to stop a moving object. We ordinarily experience this as a muscular effort and say that we must push or hit or pull on an object to change its state of motion. The concept of force is based on this push, hit or pull. Let us now ponder about a ‘force’. What is it? In fact, no one has seen, tasted or felt a force. However, we always see or feel the effect of a force. It can only be explained by describing what happens when a force is applied to an object. Pushing, hitting andpulling of objects are all ways of bringing objects in motion (Fig. 9.1). They move because we make a force act on them. From your studies in earlier classes, you are also familiar with the fact that a force can be used to change the magnitude of velocity of an object (that is, to make the object move faster or slower) or to change its direction of motion. We also know that a force can change the shape and size of objects (Fig. 9.2).

9.1 Balanced and Unbalanced Forces

Fig. 9.3 shows a wooden block on a horizontal table. Two strings X and Y are tied to the two opposite faces of the block as shown. If we apply a force by pulling the string X, the block begins to move to the right. Similarly, if we pull the string Y, the block moves to the left. But, if the block is pulled from both the sides with equal forces, the block will not move. Such forces are called balanced forces and do not change the state of rest or of motion of an object. Now, let us consider a situation in which two opposite forces of different magnitudes pull the block. In this case, the block would begin to move in the direction of the greater force. Thus, the two forces are not balanced and the unbalanced force acts in the direction the block moves. This suggests that an unbalanced force acting on an object brings it in motion. box with a small force, the box does not move because of friction acting in a direction opposite to the push [Fig. 9.4(a)]. This friction force arises between two surfaces in contact; in this case, between the bottom of the box and floor’s rough surface. It balances the pushing force and therefore the box does not move. In Fig. 9.4(b), the children push the box harder but the box still does not move. This is because the friction force still balances the pushing force. If the children push the box harder still, the pushing force becomes bigger than the friction force [Fig. 9.4(c)]. There is an unbalanced force. So the box starts moving.

What happens when we ride a bicycle? When we stop pedalling, the bicycle begins to slow down. This is again because of the friction forces acting opposite to the direction of motion. In order to keep the bicycle moving, we have to start pedalling again. It thus appears that an object maintains its motion under the continuous application of an unbalanced force. However, it is quite incorrect. An object moves with a uniform velocity when the forces (pushing force and frictional force) acting on the object are balanced and there is no net external force on it. If an unbalanced force is applied on the object, there will be a change either in its speed or in the direction of its motion. Thus, to accelerate the motion of an object, an unbalanced force is required. And the change in its speed (or in the direction of motion) would continue as long as this unbalanced force is applied. However, if this force is removed completely, the object would continue to move with the velocity it has acquired till then.

Please refer to attached file for NCERT Class 9 Science Force And Laws Of Motion

 NCERT Class 9 Science Matter In Our Surroundings NCERT Class 9 Science Matter In Our Surroundings Questions
 NCERT Class 9 Science Is Matter Around Us Pure NCERT Class 9 Science Is Matter Around Us Pure Questions
 NCERT Class 9 Science Atoms And Molecules NCERT Class 9 Science Atoms And Molecules Questions
 NCERT Class 9 Science Structure Of The Atom NCERT Class 9 Science Structure Of The Atom Questions
 NCERT Class 9 Science The Fundamental Unit Of Life NCERT Class 9 Science The Fundamental Unit Of Life Questions
 NCERT Class 9 Science Tissues NCERT Class 9 Science Tissues Questions
 NCERT Class 9 Science Diversity In Living Organisms NCERT Class 9 Science Diversity In Living Organisms Questions
 NCERT Class 9 Science Motion NCERT Class 9 Science Motion Questions
 NCERT Class 9 Science Force And Laws Of Motion NCERT Class 9 Science Force And Laws Of Motion Questions
 NCERT Class 9 Science Gravitation NCERT Class 9 Science Gravitation Questions
 NCERT Class 9 Science Work And Energy NCERT Class 9 Science Work And Energy Questions
 NCERT Class 9 Science Sound NCERT Class 9 Science Sound Questions
 NCERT Class 9 Science Why Do We Fall Ill NCERT Class 9 Science Why Do We Fall Ill Questions
 NCERT Class 9 Science Natural Resources NCERT Class 9 Science Natural Resources Questions
 NCERT Class 9 Science Improvement In Food Resources NCERT Class 9 Science Improvement In Food Resources Questions
 NCERT Class 9 Science Solutions and Answers

Science NCERT Book Class 9 Chapter 9 Force and Laws Of Motion

The above NCERT Books for Class 9 Science Chapter 9 Force and Laws Of Motion have been published by NCERT for latest academic session. The textbook by NCERT for Chapter 9 Force and Laws Of Motion Science Class 9 is being used by various schools and almost all education boards in India. Teachers have always recommended students to refer to Chapter 9 Force and Laws Of Motion NCERT etextbooks as the exams for Class 9 Science are always asked as per the syllabus defined in these ebooks. These Class 9 Chapter 9 Force and Laws Of Motion book for Science also includes collection of question. We have also provided NCERT solutions for Class 9 Science which have been developed by teachers of StudiesToday.com after thorough review of the latest book and based on pattern of questions in upcoming exams for Class 9 students.

NCERT Book Class 9 Science Chapter 9 Force and Laws Of Motion

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Chapter 9 Force and Laws Of Motion NCERT Book Class 9 Science

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Class 9 Science Chapter 9 Force and Laws Of Motion NCERT Book

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Class 9 Chapter 9 Force and Laws Of Motion NCERT Book Science

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