Unit 1
Motion
Projectile
Motion
Motion to Date
Uniform Motion
Accelerated Motion
Relative Motion
Uniform Motion
Motion with a constant velocity
Equation:
d
v
t

Constant speed

Same direction
Problems
1. An airplane travels 300 km in 1.25
hours. Find its speed.
2. A hunter travels 3 km [N] in 0.75 h
and 2 km [E] in 30 minutes. Find
her average:
A) speed
B) velocity
3.
A kayaker can travel at 4 m/s relative to
the water.
If she is in a river that has a current of 2
m/s [S] find her velocity with respect to
(wrt) the (i) shore and (ii) water
if she heads
A) Upstream
B) Downstream
C) Directly across the stream
Applet
VECTOR REVIEW??
Vector Addition
–
http://hyperphysics.phy

astr.gsu.edu/hbase/vect.html
Suppose the river is 50 m wide. How
far will the kayak land downstream
on the other side?
4.
Suppose the kayaker want to land
directly across the stream.
A) Find the angle she would have to point to
do so.
B) Find the time it would take for her to get
to the other side.
Accelerated motion
Motion with changing velocity
Examples?
Accelerated motion occurs when
either
–
the speed is changing
speeding up or slowing down
–
Direction is changing
Curved motion
Equations for accelerated motion
Page 56 text
Formula Sheet
Examples
1.
A cyclist can accelerate from 10.
km/h to 30. km/h in 3.5s. Find his
acceleration.
2.
A glove is dropped from a chairlift
and hits the ground 2 seconds later.
A)
How high is the chairlift?
B)
How fast was the glove travelling
when it hit the ground?
3.
Police measure skid marks to
determine the speed of a car just
before skidding started. If the
acceleration of car is 7.5 m/s
2
(based
on the surface condition of the road)
and the length of the skid is 45 m,
determine the speed the car was
traveling before locking the tires.
(Assuming the car was stopped at
the end of the skid.)
4.
Determine the speed the object
hits the ground.
100 m
The object has an initial upwards velocity
of 25 m/s.
5.
Determine the time it would take a
rock to hit the ground if:
A) it was dropped from a height of 2 m.
B) thrown upwards at 20 m/s from the
2 m height.
C) thrown downwards at 20 m/s from
the 2 m height.
Page 74
#
54, 55, 65, 66
What is projectile motion?
Anything that is thrown that has
some
_____________
motion.
–
Jumping on a
_____, ___, __________,
_________
, skakeboards, __________,
horses, ______.
–
Running off a
________________
.
–
_____________________
that are shot.
–
Throwing
__________
or
___________
,
or kicking a
______________
.
A projectile is any object which, once
projected, continues its motion by its
own
________
and is influenced only
by the downward force of
________
.
It is important to study this if you
want objects to land in certain spots
Movie 1
Movie 2
What describes the path of a
projectile?
–
__________________
In 3204 projectile motion is limited
to negligible
_____________
–
http://physics.usask.ca/~pywell/p121/N
otes/projectile/projectile.html
–
Mythbusters
Horizontal motion (
__

direction) is
____________
(no
_____________
)
Vertical motion (
__

direction) is
_______________
(
____________
)
Distance travelled in the x

direction
is defined as
________.
Time is the
______
in both the x and
y direction.
Equations for Projectile Motion
Horizontal Motion
(x

direction)
Uniform Motion
Vertical Motion
(y

direction)
Accelerated Motion
Components of Velocity
Mathematically determine the
components of velocity at certain
points along a projectile’s motion.
–
Applet
Types of Projectile Motion
_______________
moving off a cliff
–
(
_____________________
)
Projected motion at
____________
,
and lands at a point
Projected motion at an angle
q
, and
lands at a point:
A) level with launch
B) Above launch
C) below launch
Projectiles with zero vertical
velocity
Worksheet 1
Projectiles with NON zero vertical
velocity
Worksheet 2
Worksheet 3
Assignment
The Physics of Juggling
Applet
Air resistance
Page 74

75
#54.
2
1
2
d at
2
d
t
a
2
2(553 )
9.80/
m
t
ms
The time is 10.6 s.
#55.
2
1
1
2
d vt at
#65.
#66.
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