AnswersWA-Physical Science BIntroduction to Motion

Introduction to Motion Answers

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A
A train moves uphill as it travels in a straight path.
A
A person walks 2 miles north and 2 miles west.
A
A ball rolls from the top to the bottom of a hill.
A
A race car starts and ends at the same point on a track.
4

Which scenario best describes motion?

A
a toy train in position 4 on a number line
B
a race track that is 100 meters long
C
a ball rolling from point A to point B
D
a student living 150 miles from Chicago
5

Keisha told her friend that she can get to the town library by walking one mile east, turning left, and then walking a half a mile north.Which best describes how Keisha can improve these instructions to better help her friend find the library?

A
using meters as the unit instead of miles
B
drawing a picture of the library on a line diagram
C
estimating the amount of time to get to the library
D
providing a reference point
7

Julie finds a snail on the sidewalk and wants to know whether or not the snail moves throughout the day. She places a single mark on the sidewalk next to the snail.What will Julie use the mark for initially?

d
determining how fast the snail moves
a
acting as a standard unit of measure
d
determining the displacement of the snail
a
acting as a reference point for detecting motion
8

Which describes the positions on a horizontal number line?

A
All points to the left of one are positive when one is negative.
B
All points to the right of one are positive when one is negative.
C
All points to the left of zero are negative.
D
All points to the right of zero are negative.
9

What is required in order to determine whether or not an object moves?

a
a reference point
d
distance
d
displacement
s
standard units

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