Chapter 3- Rectilinear Motion Flashcards
If acceleration occurs than the initial and final velocities will
Be different
Rectilinear motion is
Motion along a straight path
Instantaneous velocity
Velocity at an instant
Measurements taken over a time much shorter than the time of overall measurements
Average velocity
Instantaneous velocity equations
- Av= change in x/ change in time
2. In= dx/dt
Equipment for a trolley experiment on a ramp
Light sensor Runway Lamp Trolley Interrupter card Interface to computer
S as a symbol
Displacement
m
u as a symbol
Initial velocity (m/s)
v as a symbol
Final velocity
m/s
a as a symbol
Acceleration
m/s^2
t as a symbol
Time
s
1) v=u+at
Woop
2) s= (u+v)t /2
Woop
3) s=ut+0.5at^2
Woop
4) v^2= u^2+2as
Woop
What happens with absence of air resistance
Whatever the mass the object will fall freely with the same acceleration
Acceleration of free fall on earth
9.82 m/s^2
If upward velocity is assigned a positive value
Acceleration must be negative
-9.81m/s^2
If body was thrown downwards than
Direction would be the same as that of g so both can be positive values
Objects projected horizontally will
Still fall freely with a vertical downward acceleration of 9.8
Equations of motion can be applied to vertical motion to get time spent by object in free fall
Then can be applied to get horizontal displacement (from time and horizontal velocity)
Process of vertical and horizontal question
Vertical info
Into s= ut+0.5at^2
Then do horizontal info w such time
For s=u x t
Displacement time graphs
Gradient = velocity
Velocity time graph
Area under graph = displacement
Gradient= acceleration
