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What is Physics?

- Physics is the study of matter and energy

Physics has many subcategories

Mechanics- the study of motion

Dynamics- the study of causes of motion

Thermodynamics- heat behaviors

Waves, Sound, Light, Optics

Modern Physics- nuclear physics, relativity,

astrophysics, etc.

Physics is a science ? an exploration into how

things work and why

Making connections in science-- modeling and the

scientific method

A model is an analogy or comparison to a familiar

idea, e.g. comparing light waves to water waves

The Scientific Method is a problem solving

procedure

Observation of a natural phenomena

Hypothesis-- an educated guess

Experimentation leads to Theory

Wider experimentation leads to dismissal or

acceptance as Law

- descriptive, not restrictive

Physics--gt the study of matter and energy

Energy-- the ability to do work

Which is anything!

Matter Described by its specific properties

Pure EnergySound, Light, Heat

Energy-the capacity to do work

- Potential Energy
- -gravitational
- -elastic
- -chemical
- -etc.

- Kinetic Energy
- the energy contained by any object that is in

motion - unless otherwise specified, the surface of the

earth is considered stationary

(Some) Properties of Matter

Mass How much stuff - quantity of matter

Inertia A resistance to a change in motion

Volume How much space the matter takes up

Mass Density the ratio of mass to volume

m V

D

units g/cm3

This is one physical concept represented

mathematically, but it is three equations

m V

D

m D

m D?V

V

For our purposes, these are all the same base

relationship for use in problem solving.

Problem Solving Procedure

- Read through the entire problem!
- List the given information (quantity with number

and units). - Find and write a base equation for the given

information. - Put the numbers in and solve.
- Circle your final answer with correct units!

What is the density of a rectangular object that

has a mass of 63.2 g and is 3.42 cm long, 1.09 cm

wide and 2.56 cm in height?

D ?

D m V

V l w h

m 63.2 g

l 3.42 cm

w 1.09 cm

D m l w h

h 2.56 cm

63.2 g (3.42 cm)(1.09 cm)(2.56 cm)

6.62 g/cm3

The mass of a block of wood is measured to be

125.25 g. The length of the block is measured as

5.25 cm, the width is measured as 6.80 cm and the

height is measured as 8.35 cm. Find the mass

density of this wood block.

.420 g/cm3

The density of a sample of lead is found to be

11.6 g/cm3. If the mass of the lead is measured

to be 125.0 g, what must be the volume of the

sample?

A block of wood with dimensions of 5.35 cm, 3.45

cm and 2.45 cm has a mass density of .876 g/cm3.

What must the mass of that block be?

39.6 g

A wooden block of mass 115.62 g has a density of

.687 g/cm3. What must the height of the block be

if the length is 12.35 cm and the width is 8.25

cm?

A block of unknown material is found to have a

mass of 245 g and dimensions of 22.0 cm, 15.0 cm,

and 12.0 cm. Will this block float in water?

Oh yes!

What is the mass of a block of wood that has a

density of .760 g/cm3 and measures 15.0 cm by

14.0 cm by 8.35 cm?

Explain how someone may have used the scientific

method in order to solve a problem. Explain by

outlining and giving examples following each step

of the method. This example can be a scientist,

such as Copernicus, or simply an example from

every day life.

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