Gravity, Force, and Space (pg. 83-93)
Air Resistance and Fuel Efficiency
To keep a car from being slowed down by this force, the engine must exert an equal and
Car designers work hard to streamline the shape of automobile
Gravity, Force, and Space (pg. 72-82)
When an astronaut is orbiting the Earth, the head of the astronaut is weightless
If the sun were to suddenly turn into a black hole, but its mass had no change then the orbit of
Ch. 1 (pg 9-19)
I learned that in a hybrid automobile there is an engine and a battery to power the car.
When hybrids are descending a hill they can convert some of the mechanical energy back into
chemical energy to recharge
Ch.1 (pg 1-9)
Energy and Power
What I Learned
I learned that asteroids and comets on rare occasion do come close to the earth.
An asteroid a long time ago hit the Earth with a speed of 20 miles per second, which is actually
over 10 times
Atoms and Heat (pg. 56-66)
Gas Temperature and Pressure
In a solid the atoms bounce back and forth but never leave their relative positions.
The pressure of a gas is defined as the force it exerts on one square meter of area.
can be char
Nuclei and Radioactivity (pg. 108-121)
Humans are radioactive
Radioactivity is the explosion of the nucleus of the atom
More energy is released typically, a million times greater than in a chemical explosion
Neutrons are si
Chp. 2 (pg. 38-48)
All objects sitting in a room should reach the same temperature.
Some believe that the dumping carbon dioxide into the atmosphere can cause catastrophic
events in the future.
With the burning of fossil fuels
When atoms in a solid heat up they will move faster and will get more kinetic energy.
Thermal expansion happens on bridges and sidewalks. It happens when a change in the
temperature changes the shape of the
Ch. 1 (pg 19-32)
The most common way to measure power is in watts or horsepower.
1 horsepower is approximately 1 kilowatt.
The equation for power which is important is energy over time. (Power=energy/time)
It is impo
Chapter 4 Sections
What are Rays, Really?
There are many different types of rays
Alpha rays consist of 2 protons and 2 neutrons moving at a high velocity
Beta rays are energetic electrons
Cosmic rays are any radiation that comes from spa