9th Physics Chapter # 2 Notes

 UNIT # 2

KINEMATICS

IMPORTANT QUESTIONS

1. What is Brownian motion?

The motion along a zig-zag path is known as Brownian motion. For instance; motion of gas or liquid molecules.

2. Write an example of a body that is at rest and in motion at the same time.

An example of it is a passenger in a moving bus who is at rest as they are not shifting their position in relation to other people or things on the bus. The passengers and the items within the bus, however, appear to be moving to someone standing outside the bus.

3. What is meant by position?

The term position refers to the location of a place or a point in relation to some reference point known as the origin. For example, you might want to describe your school's location in relation to your home.

4. What is LIDAR gun?

A LIDAR gun is a speed gun that detects and ranges light. It measures the distance of a vehicle from the gun using the time taken by a laser pulse. The information is then used to compute the vehicle's speed.

5. Define Terminal Velocity.

The speed of freely falling objects is known as their terminal velocity because there is zero acceleration and no net force acting on the body. For instance; a paratrooper comes to ground with a terminal velocity.

6. What happen to the direction of acceleration if velocity changes?

If an object's velocity is increasing, it is accelerating in that direction. If an object's velocity is decreasing, its acceleration will be in the opposite direction.

7. What is retardation?

If a body's velocity decreases, its acceleration becomes negative. Negative acceleration can also be referred to as deceleration or retardation.

8. What is graph?

A graph is a visual representation of data about the relationship between different quantities. A graph can be used in daily life to represent data such as monthly rainfall, runs per over scored by a team, etc.

9. What is gravitational acceleration?

Gravitational acceleration is the acceleration of freely falling bodies. It is represented by the letter g. Its value on Earth's surface is approximately 10 ms^-2. g is positive for bodies falling freely and negative for bodies rising.

10. What happen to the velocity of an object with variation of height?

When an object is at its highest point, its velocity is zero; as it gets closer to the ground, it increases.

CHAPTER # 1 IMPORTANT QUESTIONS

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