An airplane is headed 50 o W of N at 300 mph. There is a crosswind of 50 mph at 20 o N of E.

What is the actual velocity of the airplane?

v plane

= (300, 140 o )

v wind

= (50, 20 o ) Week 3 1

For this motion, draw • A motion diagram with velocity and acceleration vectors • Graphs of • x • v x • a x • y • v y • a y You can neglect air resistance Week 3 2

Week 3 3

A man is shot out of a cannon at a 40 o 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 40 o angle at 30.0 m/s. How long is the man in the air?

Week 3 5

A man is shot out of a cannon at a 40 o angle at 30.0 m/s. How far away should we put the net to catch him?

Week 3 6

You’re a shot putter. You let go of the shot put 1.5m above the ground at a 42.5

o angle with an initial speed of 10 m/s.

How far will the shot put go before hitting the ground?

Week 3 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?

Week 3 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.

Week 3 9

Week 3

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, v i = 6.7 m/s • If no tape, v i = 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.

10

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Week 3 15

Draw a free-body diagram for the situation: A frog is sitting on a leaf.

Week 3 16

Draw a free-body diagram for the situation: A roofer is standing on a roof.

Week 3 17

Draw a free-body diagram for the situation: A bowling ball, thrown by Barack Obama, rolls down the alley at a constant velocity.

Week 3 18

Draw a free-body diagram for the situation: A person is falling off a cliff.

Week 3 19

Draw a free-body diagram for the situation: The space shuttle is lifting off.

Week 3 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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Week 3 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.

Week 3 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.

Week 3 24