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Forces & Motion - Coggle Diagram
Forces & Motion
Acceleration
Measures the rate of change of velocity
When an object speeds up its acceleration is +ve. When it is slowing down its acceleration is -ve.
+ve = Acceleration
-ve = Deceleration
a = (V - u) / t
a = Change in velocity / time
u = Initial Velocity
V = Final velocity
t = Time taken for the change
a = Acceleration
Unit = m/s^2
Conditions for Acceleration
Speed of the object changes
Direction of the object changes
What about objects moving with constant speed?? What is the value of acceleration?
Ans = 0
Difference between speed and velocity
Speed is rate of change of motion while velocity is rate of change of Displacement.
Speed I'd a Scalar Quantity, ie. it has magnitude and no direction. Velocity is a Vector Quantity as it is expressed in magnitude as well as direction. In other words Velocity is speed in a specific direction.
The SI Unit for speed is m/s. The unit for velocity is also ms but in a direction. Eg. 36 m/s in East.
Physical Quantities
Vector quantities
Magnitude + Direction
Expressed in terms of... :
Unit
Numerical value
Direction
Eg, Displacement, Weight, Force, Acceleration, etc.
Scalar quantities
Only magnitude. No direction
Expressed in terms of... :
A numerical value of quantity
Unit in which quantity is measured
Eg. Mass, Time, Energy, etc.
Distance
Length of actual path
Displacement
The shortest distance between the initial and final position of a body.
Speed
Distance traveled per unit time
V = D/T
Instantaneous speed
Speed at the present / that particular instant in time.
Distance / Time interval
When the time interval is made VERY SMALL
Average Speed
Total distance / Total time
When is the instantaneous speed == the average speed?
When an object moves with constant velocity. When there is no change in speed or acceleration.