# Exploring Creation With Physical Science Module 9 Study Guide

Reference Point
A point against which position is measured

Vector Quantity
A physical measurement that contains directional information

Scalar Quantity
A physical measurement that does NOT contain directional information

Acceleration
The time rate of change of an object’s velocity

Free Fall
The state of an object that is falling towards the earth with nothing inhibiting its fall

If an object’s position does not change relative to a reference point, is it in motion relative to that reference point?
No

A glass of water sits on the counter. Is it in motion?
Yes

A child is unmoving in the middle of a lake. Two girls are jogging around the lake, keeping perfect pace with each other. Relative to whom is the child in motion?
The girls

A child is unmoving in the middle of a lake. Two girls are jogging around the lake, keeping perfect pace with each other. Relative to whom is the first girl in motion?
The child

A child is unmoving in the middle of a lake. Two girls are jogging around the lake, keeping perfect pace with each other. Relative to whom is the second girl NOT in motion?
The first girl

What is the speed of a boat that travels 10 miles in 30 minutes, in mph?