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Chemistry Chapter 1 "Chemical Reactions And Equations" Class 10 CBSE NCERT
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● Stationary object :
○ fixed at a position/ stopped at a position / not moving
● Motion :
○ movement of a body or an object…
○ A body is said to be in motion when its position changes continuously with respect to time and the
point of reference
● Distance :
○ the actual length travelled by the body irrespective of the direction in which the body travels.
○ It is denoted by s.
○ Its SI unit is m
○ Can be calculated by a device called odometer
● Displacement :
○ The shortest path between the final point and the initial point along with the direction is known as
displacement.
○ It is denoted by s
Distance Displacement
distance travelled refers to Displacement refers to the straight
The actual length of the indirect path line path between the initial and the
final positions
Distance travelled only has magnitude Displacement travelled has magnitude
as well as direction
A scaler quantity A vector quantity
The magnitude cannot be zero The magnitude can be zero
Kinds Of Motion
, ● Uniform Motion
● Non-Uniform Motion
Uniform Motion
● A body is said to be in uniform motion if it travels equal distance in equal time intervals.
● The distance-time graph of the uniform motion would be a straight line inclined at a non-zero angle.
● Movement of a clock hand is an example of uniform motion
Non-Uniform Motion
● A body is said to be in non-uniform motion if it travels unequal distance in equal time intervals.
● The distance-time graph of the uniform motion would be a curved line
● Also referred to a accelerated motion.
● Movement of a freefalling object is an example of non-uniform motion
Speed
● Gives us the idea about how fast or slow a body is moving.
● Speed of a body is the distance travelled by its distance per unit time
● Speed = distance/ time
● It is denoted by v
-1
● SI unit of speed is m/s or ms
● Has ONLY magnitude
● Has no specified direction
● Is a scaler quantity
● Can be calculated using a device called speedometer
● To convert m/s to km/h multiply the value by 18/5
● To convert km/h to m/s multiply the value by 5/18
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