# Science Fall Exam

## 69 terms

### 3 steps of energy conversion

1. sort trash
2. create stock by breaking it down
3. Heats up trash without burning it

### energy

The ability to do work

### Law of Conservation of energy

-Energy can neither be created nor destroyed
-It is transferred

### Kinetic energy

The energy of motion

### Potential Energy

Stored energy (not moving)

Joules

KE=1/2mv^2
Mass, velocity

### PE formula

PE=mgh
Mass, gravity(9.8), height

KE+PE

### Chemical Energy

Energy of moleculer bonds

Heat energy

### Nuclear Energy

Energy of an atom being slit or fused

### Mechanical Energy

Energy stored in an object so it can do work

### Electrical

Energy of moving electrons

Light energy

coal
oil
natural gas
uranium

### renewable resource

a resource that can be replaced

### examples of renewable resources

wind
sun/ solar energy
biomass energy
hydrogen fuel cells
hydroelectric energy
geothermal energy

### biomass energy

chemical energy stored in living things
renewable

### geothermal energy

thermal energy beneath the earths surface

### pro and con of geothermal energy

pro: causes no pollution
con: not widely available

### fusion

likely to produce little pollution or radioactive waste

### hydrogen fuel cells

generate hydrogen by reacting hydrogen with oxygen (produces water)
renewable

### solar energy

sunlight converted into usable energy
depends on climate

### hydroelectric power

energy obtained by flowing water

### pros of hydroelectric energy

causes no pollution
cheap

### cons of hydroelectric energy

dams cause environmental issues
many of the best places for dams in the US are already being used :(

### energy can be conserved by:

reducing needs for energy
increasing efficiency of energy use
**Finding ways to do these two things is energy conservation**

ENERGY IS WORK!

Significant

### Significant

Trailing zeros with decimal

### Not significant

Trailing Zeros without decimals

### Significant

Whole numbers (1-9)

### Significant

0's in the middle

### Least Sig Fig

Rounding for Multiplication and Division

### Frame of Reference

Objects that are not moving that you can compare with a moving object

### Distance

Length Between two points

### Scalar

Amount number with no direction (distance)

### Displacement

Distance away from starting point

### vector

A quantity that has a magnitude (amount) and direction

### Speed

A change in a position overtime (no direction)

Speed Formula

### Velocity

A change in position over time including direction (vector)

Velocity Formula

Unit for speed

### m/s +Direction

Unit for velocity

### Acceleration

Change in velocity over time

### Acceleration examples

Speed up, Slow Down, Turn

### Equation Acceleration (1)

Final v - Initial
-------------
Change in time

### m/s^2

Unit for acceleration

### Force

A push or pull on an object

### newtons

what force is measured in

1kg*m/s^2

### Friction

a force opposing the motion of two objects that are touching

### Rolling, Sliding, Static

3 types of friction from weakest to strongest

### Net force

The sum of all of the forces action on an object

### Terminal Velocity

When air resistance = gravity

### V=9.8*t

Terminal Velocity Equation

### 1st law

An object in motion stays in motion (law of inertia)

### Inertia

Tendency of an object to remain doing what its doing

F=ma

### 3rd Law

For every action there is an equal an opposite reaction

### P=mv

Equation for momentum

Weight Equation

### kg*m/s

Unit for momentum

Force Equation

### Carson

The most amzing erson in the world