PHYSICS 1300 NOTES

Average Speed= -stane
e




2I
Sample problem .




diameter 10 min
Swimmer cross circular
swimming pool of a 225




a) Calculate the
spes to


Speedar-average
= 0 .
82 m/s

3) at the same how take
average speed ,
long would the swimmer to swim

around the
edge of the pool ?
because know the
information given to must the
we
only us , we
rearrange
to
formula use what we have



d
Ot =

Speedau

=
(TT) 10 m m
>
- because we are
doing the whole pool circumfrance
,


0 82 m/s
.




= 64S
#
Checkpoint
car
goes arg Speed of
. 20 mis
for half an hour . Truck
goes arg speed
same time Which travelled
of 72 kemh
for .

further?

convert km/h

to
Cancel
(t) Trucke (Speedarg)
d
(Speedarg) d (t)
totes
car = :
outuni re = =



= (30 min) /20 m/s) x = (72 /em/k) 10. Sk).




= 36000 m = 36 /em = 36 /em




· Both Cars travelled the Same distance

, Sample problem 2 2 .




the
calculate
average Velocity & Speed for the 2 cars
travelling alps

Tourist takes 90 min to travel 45 lem

Local driver takes 4 0 min to travel is
.
Rem


* Note , the local tool east to the
a tunnel at the bottom
of the mountain
going
the tourist. Both have the same
exact same
spot as
people displacement
as
they Started & ended in the same
spot just different
,
distance



*
Displacement is
always the straight path from Start to
finish ,
also


typically the smallest value when
given
2
diff values




Vargen
Tourist local



in
Vary
=
= =




- min
= s n
10 lem/h
Varg lem/h
=
100
Varg =




Tourist Local
Speedarg Speedarg
= = = =
+
+

=
Ase : Islem
0 .
-




/Sh


30 lem/n =
100 lem/h
Speedarg Speedarg
=




Acceleration

t Velocita
Par :

<U +z -t
↳ Since we
only dealing
are w/
constant acceleration instantinous ,
acceleration
will
always equal each other (average acceleration)

E,
Uh 3
= 0

t if v =
Vo + (a) (t) - soli
a
constant
acceleration