2.9 Quiz Review

A car traveling southward towards Atlanta at 65 mph hits traffic and comes to a stop.  What is the direction of the acceleration for the car?

• Southward

• Down

• Northward

• Up

Which statement about vectors and scalars is TRUE?

• A vector is a large quantity, and a scalar is a small quantity.

• A vector quantity is described with a direction, and a scalar quantity is not.

• The quantity 20 m/s north is both a vector and scalar quantity.

• A scalar quantity has a magnitude, and a vector quantity does not.

Which statement about distance and/or displacement is TRUE?

• If a car drives north 20 miles and then east 30 miles, the distance and displacement are the same value.

• A person makes a round-trip journey, finishing where they started.  The displacement for the trip is 0, and the distance is some non-zero value.

• The phrase “20 miles northwest” describes the distance for a motion.

• Distance is a vector quantity, and displacement is a scalar quantity.

An airplane traveling north at 220 m/s encounters a 50 m/s crosswind blowing east.  What is the resultant velocity of the airplane?

• 226 m/s northeast

• 214 m/s northeast

• 270 m/s northeast

• 170 m/s northeast

What is the resultant of A – B?

• 4 m right

• 8 m left

• 8 m right

• 4 m left

What is the resultant of C + D?

• 3 m down

• 11 m up

• 11 m down

• 3 m up

What is the resultant of B + C?

• 6 m northeast

• 2 m northeast

• 4.47 m northwest

• 20 m northeast

If a car moves 12 km north, 19 km east, and 12 km south, what is its displacement?

• 12 km

• 31 km

• 19 km east

• 43 km east

Which of these is not a vector quantity?

• Displacement

• Time

• Velocity

• Acceleration

A vector is an arrow with both _______ and _______.

• Wings

• Halos

• Direction

• Magnitude

• Time