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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.

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?

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

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