Ch. 11 TEST

A horizontal line on a distance-time graph means the

object is

• a. moving at a constant speed.

• b. moving faster.

• c. slowing down.

• d. at rest

Speed is the ratio of the distance an object moves to

• The size of the object

• The direction in which the object is moving
• The weight of the object
• The time it takes to travel that distance

Displacement vectors of 1 km south, 3 km north, 6 km

south, and 2 km north combine to a total displacement of

• 2 km north
• 2 km south
• 4 km south
• 6 km north

A horizontal line on a distance-time graph means the

object is

• Moving at a constant speed
• Not moving
• Accelerating
• Decelerating

A passenger in the rear seat of a car moving at a steady

speed is at rest relative to

• The front seat of the car
• The road
• The car's engine
• The car's radio

A person drives north 3 blocks, then turns east and drives

3 blocks. The driver then turns south and drives 3 blocks.

How could the driver have made the distance shorter while

maintaining the same displacement?

• by driving east 3 blocks from the starting point

• By driving straight east 3 blocks, then straight south 3 blocks
• By driving straight north 3 blocks, then straight south 3 blocks
• By driving straight east 3 blocks, then straight north 3 blocks

Which distance can be most accurately measured with

a ruler?

• The distance between two cities
• The length of a football field
• The height of a building
• The length of a pencil

A car traveled 88 km in 1 hour, 90 km in the next 2 hours,

and then 76 km in 1 hour before reaching its destination.

What was the car’s average speed?

• 84 km/h
• 88 km/h
• 78 km/h
• 64 km/h

A train approaching a crossing changes speed from

25 m/s to 10 m/s in 240 s. How can the train’s

acceleration be described?

• The train’s acceleration is positive.

• The train is not accelerating.

• The train will come to rest in 6 minutes.

• The train’s acceleration is negative.

Which example describes constant acceleration due

ONLY to a change in direction?

• A car speeding up on a straight road
• A ball being thrown straight up and falling back down
• A car moving at a constant speed around a circular track
• A person walking at a constant speed on a straight path