1.1 Speed and Velocity in One and Two Dimensions

A scalar quantity has:

• direction but no magnitude

• magnitude but no direction

• direction and magnitude

• no direction or magnitude

Which of these is not a scalar quantity?

• 8 kg

• 12 km

• 8 m [up]

• 62 L

Jelly swims 7.0 m in 14 s. What is Jelly's average speed?

• 0.50 km/h

• 0.50 m/s

• 2.0 km/h

• 2.0 m/s

A vector quantity has:

• direction but no magnitude

• magnitude but no direction

• magnitude and direction

• no magnitude or direction

Which of these is not a vector?

• 8.4 m/s

• 92 m [E]

• 582 km/h [up]

• 38 cm [left]

Position and displacement are different because:

• position is where you are and displacement is where you want to be

• position is where you want to be and displacement is how you get there

• position is where you are and displacement is where you were

• position is where you are and displacement is the change in position

Which of the following would have zero velocity but a non-zero speed?

• A racecar driving in a straight line

• A swimmer who swims diagonally to the opposite side of the pool

• A runner who runs to the opposite wall then runs back to her starting position

• A mailman who visits 37 different houses

This object's velocity is:

• changing and heading west

• constant and heading west

• changing and heading east

• constant and heading east

At which time is the object traveling the quickest?

• 6 s

• 5 s

• 2 s

• 0 s

Is there a time when the object's velocity is 0 m/s?

• Yes

• No