# Physical Science Exam Study Guide

## 30 terms

### What is mechanics?

Modern study of motion

### What is kinematics?

A description of how things move

### What is dynamics?

A description of what causes things to move

### What is a boundary?

Actual surfaces, or imaginary boxes

### What is a system?

Everything inside the boundary

### What is a surrounding?

Everything outside the boundary

### What is an accelerated reference frame?

Observational reference frame is accelerationg with object

### What is a fixed reference frame?

You are in a fixed position watching the object moving

### What is a rotational reference frame?

Rotation objects are stationary

### What is a coordinate axis?

Imaginary line marked off in units

### How do you calculate the time interval?

Subract the intial time from the final time

arrows

### What is motion?

it occurs when a system's postion changes during an interval of time

### What is acceleration?

The rate of change of the speed of velocity during a given time interval

### What is force?

a push or pull on a system

### What unit is used to describe force, and what does it mean?

(N) it means Newton

### What is free fall?

When an object is falling do to gravity alone

9.81 or just 9.8

### What is drag?

A form of friction call air resistance

### What is terminal velocity?

When the objects velocity is constant for the remainder of it's fall

### What is momentum?

How much force is required to change a moving objects motion

### What is velocity?

The rate of displacement

### What is inertia?

Objects continue moving indefintely unless they are affected by some external force

### What number represents G?

6.67*10^-11 (six point six seven times ten to the negative eleven)

### What are the two properties of a moving object that affect its momentum?

mass and velocity

### What three variacle factors determine the force of gravity between any two objects?

mass 1 and mass 2, and destance between the centers

kg(m/s2)

### What is distance?

Distance is how far you actually traved

### What is displacement?

How far you are from when you started

### What is the difference between scalar and vector

scalar is speed and vector is direction