BJU Physical Science Chapter 11

Examine the figure. If you were standing under the tree, which object would appear to be   moving?

• the tree
• the airplane
• the boy
• the building

A passenger in the rear seat of a car moving at a steady speed is at rest relative to

• the side of the road.
• a pedestrian on the corner ahead.
• the front seat of the car.
• the wheels of the car.

Which distance can be most accurately measured with a ruler?

• the length of a river
• the width of a book
• the distance between two cities
• the size of an object under a microscope

A person walks 1 mile every day for exercise, leaving her front porch at 9:00 am. and returning to her front porch at 9:25 am. What is the total displacement of her daily walk?

• 1 mile
• 0
• 25 minutes
• none of the above

A ball is rolled uphill a distance of 5 meters before it slows, stops, and begins to roll back. The ball   rolls downhill 9 meters before coming to rest against a tree. What is the magnitude of the ball’s displacement?

• 4 meters
• 9 meters
• 14 meters
• 45 meters

Displacement vectors of 4 km south, 2 km north, 5 km south, and 5 km north combine to a total displacement of

• 16 km north
• 11 km west
• 6 kn south
• 2 km south

Speed is the ratio of the distance an object moves to

• the amount of time needed to travel the distance.
• the direction the object moves.
• the displacement of the object.
• the motion of the object.

Instantaneous speed is measured

• at the starting point.   
• when the object reaches its destination.
• at a particular instant.
• over the duration of the trip.

A car traveled 60 km in 2 hours, 84 km in the next 1 hour, and then 68 km in 2 hours before   reaching its destination. What was the car’s average speed?

• 212 km/hr
• 42 km/hr
• 148 km/hr
• 1060 km/hr

The slope of a line on a distance-time graph is

• distance
• time
• speed
• displacement