An airplane is headed 50o W of N at 300 mph.
There is a crosswind of 50 mph at 20o N of E.
What is the actual velocity of the airplane?
vplane = (300, 140o)
Week 3
vwind = (50, 20o)
1
For this motion, draw
• A motion diagram with velocity and
acceleration vectors
• Graphs of
•x
• vx
• ax
•y
• vy
• ay
You can neglect air resistance
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2
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3
A man is shot out of a cannon at a 40o angle at
30.0 m/s.
What is the man’s maximum altitude above the
crowd?
Week 3
4
A man is shot out of a cannon at a 40o angle at
30.0 m/s.
How long is the man in the air?
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5
A man is shot out of a cannon at a 40o angle at
30.0 m/s.
How far away should we put the net to catch him?
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6
You’re a shot putter. You let go of the shot put 1.5m
above the ground at a 42.5o angle with an initial
speed of 10 m/s.
How far will the shot put go before hitting the
ground?
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7
A bullet is shot horizontally from a rifle at 300 m/s
and hits a tree 50 meters away. The person
shooting is holding the gun 5 feet (1.5 meters)
above the ground.
How far from the ground is the bullet hole in the
tree?
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8
A rocket drifts sideways in outer space from point “a” to
point “b” as shown. Starting at position “b”, the rocket’s
engine is turned on and produces a constant thrust at
right angles to the line “ab”. The constant thrust is
maintained until the rocket reaches point “c” in space.
QuickTime™ and a
TIFF (LZW) decompressor
are needed to see this picture.
Which of the paths below best represents the path of
the rocket between points “b” and “c”?
QuickTime™ and a
TIFF (LZW) decompressor
are needed to see this picture.
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9
QUIZ!
• Each group take a launcher and tape measure
• Choose an angle and set your launcher to that
angle.
• If launcher has a piece of tape, vi = 6.7 m/s
• If no tape, vi = 6.3 m/s
• Calculate how far away you need to be to hit a
target at the same height.
• Turn in calculations when done and help other
groups.
• When all calculations are done, get ball, rod
and safety glasses for launching.
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15
Draw a free-body diagram for the situation:
A frog is sitting on a leaf.
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16
Draw a free-body diagram for the situation:
A roofer is standing on a roof.
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17
Draw a free-body diagram for the situation:
A bowling ball, thrown by
Barack Obama, rolls down the
alley at a constant velocity.
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18
Draw a free-body diagram for the situation:
A person is falling off a cliff.
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19
Draw a free-body diagram for the situation:
The space shuttle is lifting off.
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20
Draw a free-body diagram for the situation:
A kid is speeding up as he
goes down a big slide.
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22
LAB 3 OBJECTIVES
• To develop a method for measuring forces
reliably.
• To learn how to use a force probe to measure
force.
• To explore how the motion of an object is related
to the forces applied to it.
• To find a mathematical relationship between the
force applied to an object and its acceleration.
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23
You’re pulling your kid sister in
a wagon and she wants you to
go faster. Graph the wagon’s
position, velocity, acceleration
and net force vs time as you
make the wagon speed up.
QuickTime™ and a
TIFF (Uncompressed) decompressor
are needed to see this picture.
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