# Chapters 1-4 Physics- PRUCNAL

## 68 terms

### Step 1 of the Scientific Method

recognize question

hypothesis

### Step 3 of the Scientific Method

predict consequences of hypothesis

### Step 4 of the Scientific Method

perform experiment to test hypothesis

### Step 5 of the Scientific Method

formulate general rule that organizes: hypothesis, prediction, experimental findings

### Physics

The basic science; nature of basic things: motion, force, energy, heat, sound, light, atoms, matter

crescent shape

circle

### Science

the gathering of knowledge and organizing it

### technology

application of science

### Copernicus

Published book that sun is stationary and that eath revolves around it

### centigram balance

accurately compares masses anywhere; measures in centigrams

### centigram balance

measures the mass of an object by comparing it to a standard mass

### mass

amount of matter in an object

### weight

gravitational attraction

pinhole images

### Science is a body of knowledge that:

is an ongoing activity for humans, describes order in nature, condenses knowledge into testable laws

coin

### The earth, like everything else illuminated by the sun, casts a shadow that..

tapers because of the huge size of the sun

fake science

true

### A spring Scale measures

weight and the force of gravity acting apon the object

theory; law

applied science

150,000,000 km

educated guess

### What is newtons first law?

if there is no force acting on an object, it will stay as it is

a push or pull

### external force

A force that acts on a system from outside the system

### net force

the vector sum of forces that act on an object

### normal force

an upward force opposite to the force of gravity

stretching force

### gravity

the force of attraction between all masses in the universe

### friction

force that acts to resist the relative motion of objects or materials that are in contact

### Galileo

dropped objects of various weights from the Tower of Pisa to compare their falls; they hit ground at same time

### euqilibrium

state of no change

### terminal velocity

terminal speed together with the direction of motion, no more acceleration

### When a rocket ship accelerating in outer space runs out of fuel it..

doesnt accelerate

inertia

100N

### A monkey hangs stationary from a vertical vine. What two forces act on the monkey?

tension and gravity

### If no external forces are acting on an object, it will...

continue moving at the same velocity

### The closer two objects are to each other..

the greater the force of gravity between them

### A book lies on a table. What force acts on the book?

gravity and normal force

### aristotle

one of the first people to study physics; divided motion into natural and violent

independent of

### acceleration

change in velocity

### average speed

the time of travel

### instantaneous speed

speed at any particular instant

### velocity

the speed of an object and a specification of its direction of motion

### free-fall

motion only under the influence of gravity

### vector

has magnitude and direction

### scalar

only has magnitude

### speed

how fast something moves

decrease

### When a rock thrown straight upwards gets to the exact top of its path___.

its velocity is zero and its acceleration is zero

velocity.

### the two measurements necessary for calculating average speed are____.

distance and time

velocity

Galileo

true

### newton's 2nd law

acceleration= force/mass

force

weight

force

### Force is a vector quantity because it has both ___ and ____.

magnitude and direction