Physics Unit 1 Review

One kilometer equals 1000 meters. What does the prefix "kilo" mean?

• 1
• 10
• 100
• 1000

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

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

A person drives north 6 blocks, then turns west and drives 6 blocks. The driver then turns south and drives 6 blocks. How could the driver have made the distance shorter while maintaining the same displacement?

• by driving west 6 blocks from the starting point
• by driving north 4 blocks and west 7 blocks
• by driving south 6 blocks from the starting point
• by driving back to the starting point by the same route

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/h
• 42 km/h
• 148 km/h
• 1060 km/h

A distance-time graph indicates that an object moves 100 m in 4 s and then remains at rest for 6 s. What is the average speed of the object?

• 50 m/s
• 25 m/s
• 10 m/s
• 100 m/s

A river current has a velocity of 5 km/h relative to the shore, and a boat moves in the same direction as the current 5 km/h relative to the river. How can the velocity of the boat relative to the shore be calculated?

• by subtracting the river current vector from the boat's velocity vector
• by dividing the river current vector by the boat's velocity vector
• by multiplying the vectors
• by adding the vectors

Vector addition is used when motion involves

• more than one direction.
• more than one velocity.
• more than one speed.
• all of the above

The rate at which velocity changes is called

• speed.
• vectors.
• acceleration.
• motion.