Motion Flashcards
Define distance
It is a scalar quantity that is the total length of the path covered
Define displacement
It is a vector quantity, that is the shortest straight line from the initial position to the final position
Define Speed
Speed is a scalar quantity which is the distance covered per unit time/ the rate of distance travelled
Define Velocity
It is a vector quantity which is the rate of displacement per unit time/ rate of displacement
SI and CGS units of speed and velocity
For both:
SI- m/s
CGS- cm/s
Speed formula
Distance/ time
Velocity formula
Displacement/ time
Define uniform motion
When a body travels equal distances in equal intervals of time, and it’s speed is constant
Define non-uniform motion
When a body travels unequal distances in equal intervals of time, and the speed is not constant
A body is said to be accelerating when
The speed of the body gradually increases per unit time
Acceleration formula
Acceleration= final - initial velocity/ time
a= v-u/t
A body is said to be decelerating/ retarding when
The speed of the body gradually decreases per unit time
If v>u
a=+ve (positive acceleration)
If u>v
a=-ve (negative acceleration(
SI unit of acceleration
m/s^2
SI unit of retardation
-m/s^2
Average Speed formula
Total distance/ total time
Average velocity formula (if direction changes)
Total displacement/ total time
What is an Odometer
Instrument that measures the total distance covered by a vehicle
What is a Speedometer
Instrument that shows the current speed of the given vehicle
Average Velocity (if direction does not change)
v+u/2
1st equation of motion
v = u + at
2nd equation of motion
s = ut + 1/2 at²
3rd equation of motion
2as = v² - u²
