motion chapter samjhe nhi aaye
Answers
Explanation:
Motion:
Movement of any object from one position to another position with respect to the observer is called as Motion.
Motion Along a Straight Line:
When an object moves along a straight line, the motion of the object is called rectilinear motion. For example; motion of a car on highway.
Vectors and Scalar Quantities:
Vector is a quantity which has both magnitude and direction. For example, Force, position, etc.
Scalar is a quantity with which direction is not associated. For example, Mass, temperature, time, etc.
Distance:
Length of path covered by a moving an object in the given time irrespective of the direction
is called distance.
It is a scalar quantity.
Its SI unit is metre(m).
Displacement:
The shortest distance measured from initial to the final position of an object is known as the displacement.
It is a vector quantity.
Uniform Motion: When an object covers equal distances in equal intervals of time, it is said to be in uniform motion.
Non-Uniform Motion:
When an object covers unequal distances in equal intervals of time, it is said to be in non-uniform motion.
Speed (s):
The distance travelled by an object in unit time is referred to as speed.
It is represented as:
Its SI unit is metre/ second (m/s).
It is a scalar quantity.
Average speed: For non-uniform motion, the average speed of an object is obtained by dividing the total distance travelled by an object by the total time taken.
Average Speed
Velocity (v):
Speed of an object in a particular direction is named as velocity, i.e., it is the displacement of body in unit time.
It is represented as:
Jagranjosh
It is a vector quantity.
Average velocity: It is given by the arithmetic mean of initial velocity and final velocity for a given period of time.
Jagranjosh
Acceleration (a):
The rate of change of velocity is termed as acceleration.
It is represented as:
Acceleration
Its SI unit is metre/seccond2 (m/s2).
It is a vector quantity.
The acceleration is taken to be positive if it is in the direction of velocity and negative when it is opposite to the direction of velocity.
Negative acceleration is also named as retardation or deacceleration.
An object moving on a circular path though with uniform speed, is always said to be accelerated as it changes its direction every moment.
Uniform acceleration: When velocity of body changes by equal amounts in equal time intervals, acceleration is said to be uniform. For example: Motion of a freely falling ball.
Non - uniform acceleration: When velocity of body changes by unequal amounts in equal intervals if time, acceleration is said to be non - uniform. For example: Motion of car.
Graphical Representation of Motion
1. Distance -Time Graph for Uniform Speed:
Distance -Time graph for uniform speed, is a straight line as shown below:
Distance Time Graph for Uniform Speed
2. Distance -Time Graph for Non-Uniform Speed:
Distance -Time graph for uniform speed, is obtained in the form of a curve as shown below:
Distance Time Graph for Non Uniform
3. Distance -Time Graph for a Body at Rest:
Distance -Time graph for a body at rest is a straight line parallel to the time axis (x-axis):
Distance Time Graph for Body at Rest
1. Velocity-Time Graph for Uniform Acceleration:
Velocity-Time graph for uniform acceleration is a straight line as shown below:
Velocity Time Graph for Uniform Acceleration
2. Velocity-Time Graph for Non-Uniform Acceleration:
Velocity-Time graph for non-uniform acceleration is obtained as a zig-zag line as shown below:
Velocity Time Graph for Non Uniform Acceleration
Explanation:
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