cbse class 9 physics motion notes

Velocity-Time graphs show the change in velocity with respect to time. Body is moving with uniform velocity but not starting from rest .

Let’s say first it is at position A then after some it moves to position B. This is average speed.

Please send note science in englsh class 9. Can it have zero displacement?

What does the path of an object look when it is in uniform motion?

A racing car has uniform acceleration of 4m/sec2 . } To know more about Distance-Time Graph, visit here. It can be defined as total path covered by body in any direction. Distance-Time graphs show the change in position of an object with respect to time.

} It can be zero: whenever a body starts from one point and returns to the same point the displacement is zero.

An artificial satellite is moving in a circular orbit of radius 42,250 km. S= (u+v) x t. You must have encountered roundabout while travelling on a road or you must have seen the athletes running in a circular track there the motion is not in a straight line there one has to move in circles. Example: A train running at a speed of 90 km/hr. : (a) when a body is projected upwards, its velocity at highest point reached is zero although it has uniform acceleration.

Brakes is applied so as to produce a uniform acceleration of -0.5m/sec2 . The Newton’s laws of motion are three physical laws that, collectively, laid the foundation for classical mechanics in physics.

This reference point, stationary object does not change its position. Q. We say that an object is in motion when its position changes with time. Q. Which of the following is true for displacement?

Example: A passenger inside a bus sees the other passengers be at rest, whereas an observer outside the bus sees the passengers are in motion.

The graph drawn to show non uniform motion is: We all often say to a driver that drive carefully or drive slowly. It is the distance covered by a body per unit time in a given direction. What will be the magnitude of displacement of the farmer at the need of 2 minutes and 20 seconds? So we are going to study in detail what exactly is the term motion. When will you say that body is in uniform acceleration and non uniform acceleration? When velocity undergoes unequal changes in equal intervals of time and the direction may not be a straight line, Example: Body moving with variable velocity. A scooter acquires a velocity of 36 km/hour in 10 seconds just after the start. CBSE Class 9 Physics Motion Notes.

Hence, it is very important to master these concepts at the early stages as these laws forms the basis of your preparation for JEE Mains and JEE Advanced, EAMCET, BITSAT, NEET and other engineering and medical entrance examinations. Now we have seen that motion of car can be easily seen that is we don’t have to concentrate much but to know the movement of arm of clock let’s say hour hand we need to keep check this is because some motion is that fast that we can see it happening, on the other hand some motion is so slow that it can’t be seen clearly. Ans. It is a vector quantity. LSagar.

Then its initial velocity is 20m/sec and final is 40m/sec

Ans.

It is defined as the total distance travelled by body divided by total time taken to cover distance.

A scooter moving with a speed of 10m/sec is stopped by applying brakes which produce uniform acceleration of -0.05m/sec. When body covers equal distances is equal intervals of time in a straight line (given direction). The Rate of change of displacement is velocity. The SI unit of speed is metre per second.

When velocity of a body undergoes equal changes in velocity in equal intervals of time in straight line. Distinguish between speed and velocity?

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