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| 1st Year Physics Notes Chapter 3 - 11th Class Notes pdf |
1st Year Physics Notes Chapter 3 Important Short Questions
Q.1 Define and provide an explanation for the subsequent phrases?
(1) Displacement
(2) Velocity
(3) Average pace
(4)1 Instantaneous pace
(5) Acceleration
(6) Average acceleration
(7) Instantaneous acceleration
(1) Displacement
The alternate role of the frame from its preliminary role to its very last role is known as displacement Which tells us how a long way and in what path the frame has displacedUnit The SI unit of displacement is meter (m).
Magnitude: Its importance is the same as the period of the road It offers the gap among the preliminary and very last role
(2) Velocity
The time fee of alternate of displacement of a frame is known as pace
(three) Average pace
The ratio of the full displacement to the full time taken to cowl this displacement is known as common pace
- Limitation of common pace does now no longer inform us that
- The movement is consistent or variable
- The course is instantly or curved
Unit
SI unit is m/sec (in ms)
It is a vector amount
Its path of pace is alongside the path of displacement
Q. Under what circumstance the frame is stated to be transferring at a uniform pace?
Answer
If the common and immediately pace of a frame is the same the frame is transferring with a uniform pace
OR
If the immediate pace does now no longer alternate the frame is stated to be transferring with a uniform pace
(5) Acceleration
The time fee of alternate of the pace of a frame is known as acceleration Unit
SI unit of acceleration is m/sec
The dimensions of acceleration are
Direction
Acceleration is likewise a vector amount as the pace is a vector amount The path of acceleration is alongside the path of pressure
Positive Acceleration
If the speed of a frame is increasing
Its acceleration is superb
Negative Acceleration
If the speed of a frame is reducing its acceleration is bad The bad acceleration is likewise known as retardation or deceleration.
- A frame is transferring with consistent pace then acceleration is 0 Uniform acceleration
- A-frame has uniform acceleration if it has the same modifications in pace in same durations of time but quick the c language maybe
- Acceleration of a frame is superb if its pace will increase with time. The path of this acceleration is equal wherein the frame is transferring without alternate in its path.
Acceleration of a frame is bad if the speed of the frame decreases The path of bad acceleration is contrary to the path wherein the frame is transferring Negative acceleration is likewise known as deceleration or retardation Condition below which the frame is stated to be transferring with uniform acceleration.
For a frame transferring with uniform acceleration, its common and immediately acceleration are the same
Q. What are Displacement-time graphs? Discuss.
Answer
Distance-time graph
It is beneficial to symbolize the movement of items the usage of graphs The phrases distance and displacement are used interchangeably whilst the movement is in an instant line Similarly if the movement is in an instant line then pace and pace also are used interchangeably in a distance-time graph, time is taken alongside the horizontal axis even as the vertical axis suggests the gap protected via way of means of the item
(1) Object at relaxation In the graph
the gap moved via way of means of the item with time is 0 That is, the item is at relaxation Thus, a horizontal line parallel to the time axis on a distance-time graph suggests that the rate of the item is 0.
An item transferring with consistent pace:
The pace of an item is stated to be consistent if it covers the same distances in the same duration of time The distance-time graph is an instant line Its slope offers the rate of the item. Consider factors A and B at the graph
An item transferring with variable pace: When an item does now no longer cowl same distances in the same durations of time then its pace isn't always consistent. In this case, the gap-time graph isn't always an instant line. The slope of the curve at any factor may be located from the slope of the tangent at that factor.
Q. Discuss Newton's regulation of movement briefly.
Answer
About Newton's Law of Motion
Sir Isaac Newton posted his empirical legal guidelines of movement in his well-known ee-ebook Principia in 1687 These legal guidelines preserve accuracy for our bodies transferring at a smaller pace as compared to the rate of light.
Newton's First Law of Motion / Law of Inertia Statement
A-frame at relaxation will continue to be at relaxation and a frame transferring with uniform pace will maintain to accomplish that except an unbalanced outside pressure acts on it This is called the primary regulation of inertia
Inertial body of reference
The body of reference wherein Newton s first regulation holds and acceleration is 0 is known as the inner body of reference
Example: Earth is about an inertial body of reference Newton's Second Law of Motion
Statement
When pressure is carried out on a frame, it produces the acceleration in its path The importance of the acceleration is without delay proportional to the carried out pressure and inversely proportional to its mass
- Mathematical shape F= ma
- Newton's Third Law of Motion
Action and response are the same in importance and contrary in the path
Explanation
When our bodies have interaction with every aside from Action and response forces act for the equal period Action and response forces by no means act at the equal frame Action and response forces act at the one of a kind frame
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