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Physics: Kinematics
Descripción
Kinematics! :)
Sin etiquetas
physics
kinematics
gcse
a-level
science
physics
kinematics
singapore-cambridge gce advanced level(a- level)
Mapa Mental por
Meldy Miyashita
, actualizado hace más de 1 año
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Creado por
Meldy Miyashita
hace casi 8 años
1420
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Resumen del Recurso
Physics: Kinematics
Definition of terms
Distance: a physical unit that describes how far an object is or describes the length an object has covered during its motion. (scalar quantity)
Displacement: the distance travelled along a specified direction. (vector quantity)
Speed: the distance moved per unit of time taken. (scalar quantity)
Average speed: total distance / total time taken
Velocity: the rate of change of displacement (vector quantity)
Average velocity: total displacement moved / total time taken
Acceleration: rate of change of velocity (vector quantity)
An object that has an equal increase in velocity per unit of time has constant/uniform acceleration.
A scalar quantity only has magnitude
A vector quantity has magnitude and direction.
Kinematics equations
are used in situations in which the object has uniform acceleration and is travelling in a straight line. (one-dimensional motion/ rectilinear motion)
v = u + at
s = 1/2(v+u)t
s = ut + 1/2at^t
s = vt - 1/2at^2
v^2 = u^2 + 2as
where: v=final velocity, u=initial velocity, s=displacement, a=acceleration, t=time
Projectile motion (two-dimensional motion)
for displacement calculation, use the kinematic equation--s = ut + 1/2at^2
x-axis displacement: s = ut (no acceleration in horizontal motion)
y-axis displacement: s = 1/2gt^2
for velocity calculation, use the kinematic equation--v = u + at
x-axis velocity: v = u
y-axis velocity: v = gt
At maximum height, the velocity of the y-axis is 0.
for resultant velocity, use the Pythagoras Theorem
to find the angle of resultant velocity (between the horizontal velocity and resultant forces), use trigonometry (tan__(tither) = Vy/Vx
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