Aim: How can we distinguish between a vector and scalar quantity?

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# Aim: How can we distinguish between a vector and scalar quantity? - PowerPoint PPT Presentation

Aim: How can we distinguish between a vector and scalar quantity?. Do Now: What is the distance from A to B? Describe how a helicopter would know how to travel from A to B Distance = 10 km (scalar) Displacement = 10 km East (vector). A. B. N. W. E. 1 unit = 2 km. S. Scalar.

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Presentation Transcript

Do Now:

What is the distance from A to B?

Describe how a helicopter would know how to travel from A to B

Distance = 10 km (scalar)

Displacement = 10 km East (vector)

A

B

N

W

E

1 unit = 2 km

S

Scalar
• Quantities having only magnitude (a number)
• Ex:
• Distance – 10 m
• Mass – 5 kg
• Time – 30 s
• Speed – 50 m/s
• Energy – 500 J
Vector
• Quantities having both magnitude and direction
• Ex:
• Displacement – 10 m East
• Velocity – 50 m/s West
• Acceleration – 9.8 m/s2 down
• Weight or Force – 50 N down
Representing a Vector
• A vector is represented by an arrow pointing in a direction and drawn to a selected scale
• Ex: 4 m/s South
• Determine an appropriate scale

1 cm =

1 m/s

How can we determine angles?

N

East of North

West of North

North of East

North of West

W

E

South of East

South of West

West of South

East of South

S

Draw the Vector

40 N force 40° North of East

Scale:

1 cm = 10 N

1st directional word is

North

Protractor points north

N

40 N

40°

W

E

S

Draw the Vector

N

120 m/s 65° West of South

Scale:

1 cm = 30 m/s

1st directional word is

West

Protractor points west

E

W

120 m/s

65°

S