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) 1 unit = 2 km N S WE AB

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/s 2 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 S WE East of North North of East South of East East of South West of South South of West North of West West of North

Draw the Vector 40 N force 40° North of East Scale: 1 cm = 10 N 1 st directional word is North Protractor points north 40° 40 N N S W E

Draw the Vector 120 m/s 65° West of South Scale: 1 cm = 30 m/s 1 st directional word is West Protractor points west N S E W 65° 120 m/s