Class 9th Science Chapter 9 | Example 9.1, 9.2, 9.3, 9.4, 9.5 | Force and Laws of Motion

This video includes Example 8.1, 8.2, 8.3, 8.4, 8.5 of chapter 8 of class 9th science (Force and Laws of Motion).

If you want to view a particular example then click on the respective time frame given below
Time Frames :
Example 9.1 : 00:00
Example 9.2 : 05:01
Example 9.3 : 07:18
Example 9.4 : 11:28
Example 9.5 : 15:21

Example 9.1: A constant force acts on an object of mass 5 kg for a duration of 2 s. It increases the object’s velocity from 3 m/s to 7 m/s. Find the magnitude of the applied force. Now, if the force was applied for a duration of 5 s, what would be the final velocity of the object?

Example 9.2: Which would require a greater force –– accelerating a 2 kg mass at 5 m/s^2 or a 4 kg mass at 2 m/s^2 ?

Example 9.3: A motorcar is moving with a velocity of 108 km/h and it takes 4 s to stop after the brakes are applied. Calculate the force exerted by the brakes on the motorcar if its mass along with the passengers is 1000 kg.

Example 9.4: A force of 5 N gives a mass m1, an acceleration of 10 m/s^2 and a Mass m2, an acceleration of 20 m/s^2. What acceleration would it give if both the masses were tied together?

Example 9.5: The velocity-time graph of a ball of mass 20 g moving along a straight line on a long table is given in a figure How much force does the table exert on the ball to bring it to rest?

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Chapter 1 (Matter in Our Surroundings) Lectures Playlist:

Chapter 2 (Is Matter Around Us Pure) Lectures Playlist:

Chapter 5 (The Fundamental Unit of Life) Lectures Playlist:

Chapter 8 (Motion) Lectures Playlist:

Chapter 9 (Force and Laws of Motion) Lectures Playlist:

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