Recall that a vector has both:

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# Recall that a vector has both: - PowerPoint PPT Presentation

VECTORS. Recall that a vector has both:. Direction. Magnitude. The sum of two vectors is considered the resultant vector. +. Vector A. Vector B. A + B = R. Graphical Method. You must add vectors from head. head. to tail. tail. so. +. Vector B. Vector A. equals. Vector R.

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VECTORS

Recall that a vector has both:

• Direction
• Magnitude

Graphical Method

to tail...

tail

so...

+

Vector B

Vector A

equals

Vector R

For Example:

A man walks 275m due east then another 125 m due east. What is his resultant displacement?

A man walks 275m due east then another 125 m due east. What is his resultant displacement?

PART 1

PART 2

275 m

125 m

Using a ruler you measure from the beginning of part 1 to the end of part 2

RULER

A man walks 275m due east then another 125 m due east, what is his resultant displacement?

PART 1

PART 2

275m

125m

RULER

A man walks 275m due east then another 125 m due east. What is his resultant displacement?

275m

125m

RULER

=

RESULTANT

400m

275m

125m

A man walks 275m due east then another 125 m due west. What is his resultant displacement?

PART 1

275 m

A man walks 275m due east then another 125 m due west. What is his resultant displacement?

PART 2

125 m

Using a ruler, measure from the beginning of part 1 to the end of part 2

RULER

A man walks 275m due east then another 125 m due west. What is his resultant displacement?

RULER

A man walks 275m due east then another 125 m due west. What is his resultant displacement?

275m

125m

RULER

=

RESULTANT

150m

275m

125m

A man walks 275m due east then another 125 m due north. What is his resultant displacement?

N

PART 2

125 m

PART 1

E

275 m

Using a ruler you measure from the beginning of part 1 to the end of part 2

125 m

PART 2

PART 1

275 m

E

N

302m

=

N

RESULTANT

E

Now we have the magnitude of the resultant vector we need a direction for the resultant vector

so…

We get our protractors out and measure the angle of the resultant vector

302m

=

N

RESULTANT

24.4°

E

Resultant Vector

302 m; 24.4° North of East

ANGLE NOTATION

On the last one we wrote 40° “North of East”, b/c we were saying it went 40° North “from” East.

In your notebook try the following for practice

N

W

E

S

30°

N

W

E

S

30°

N

W

E

S

30°

N

W

E

S

30°

N

W

E

S

30°

N

W

E

S

30°

N

W

E

S

30°

• By definition, “northeast”, “southeast”, “southwest”, and “northwest” are vectors directed at 45 degrees.

When vectors are added at right angles to each other, the Pythagorean Theorem can be used to determine the magnitude of the resultant.

Trigonometric functions can be used to determine the direction.

A plane travels at 450 km/h due north with a wind blowing at 120 km/h due east. What is the resultant velocity of the plane?

120 km/h

450 km/h

120 km/h

450 km/h

tan = 120/450

R = 466 km/h 15 east of north