Physical Science Study Guide

Examine Figure 11-1. If you were standing under the tree, which object would appear to be moving?

• the tree

• the airplane

• the boy

• the building

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 a 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

• 45 meters

• 14 meters

Speed is the ratio of the distance an object moves to

• the amount of the time needed to travel the distance.

• the direction the object moves

• the displacement of the object.

• the motion of the object.

Tags

NGSS.MS-PS3-1

Instantaneous speed is measured

• at the starting point.

• when the object reaches its destination.

• at a particular instant.

• over the duration of the trip.

What is the speed of the bobsled whose distance-time graph indicates that it traveled 80 m in 20 s?

• 4 m/s

• 1600 m/s

• 80 m/s

• 0.25 mph

Tags

NGSS.MS-PS3-1

A distance-time graph indicates that an object moves 50 m in 6 s and then remains at rest for 4 s. What is the average speed of the object?

• 17 m/s

• 5 m/s

• 50 m/s

• 8 m/s

The rate at which velocity changes is called

• speed

• vectors

• acceleration

• motion

Which example identifies a change in motion that produces acceleration?

• a speed skater moving at a constant speed on a straight track

• a ball moving at a constant speed around a circular track

• a particle moving in a vacuum at constant velocity

• a vehicle moving down the street at a steady speed

Tags

NGSS.MS-PS3-5