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Physics C#3,4,5 (C#5 Density (density=mass/volume, unit for density=…
Physics C#3,4,5
C#3 Graphs and Equations
Velocity-time graphs
velocity of a body plotted against time
area under a v- t graph measures the distance travelled
uniform velocity=e.g 20m/s x 5s= 100m
uniform acceleration=increases steadily.
the slope of a v-t graph is the acceleration of the body
Distance-time graphs
distance that a body travels against the time it took
the slope of a d-t graph represents the velocity of a body
e.g 40m/2s=20m/s
Equations for uniform acceleration
u
=inicial velocity
v
= final velocity
a
= acceleration
t
= time
s
= distance
equation 1=
v=u+at
equation 2=
s=(u+v) / 2 x t
equation 3=
s= ut + 0.5at^
equation 4=
v^= u^ + 2as
C#4 Falling Bodies
All bodies that fall freely under force of gravity do so with uniform acceleration
Acceleration of free fall = g
acceleration =
G= +10m/s^
for falling objects
acceleration=
G= -10m/s^
for rising objects
C#5 Density
density=mass/volume
unit for density=
kg/cm^3
p
=density/
m
=mass/
v
=volume
p=m/v
m=v x p
v= m/p