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48 Cards in this Set

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Acceleration

Rate of velocity (slowing down or speeding up)

Acceleration units

Meters per second per second (change in velocity/total time)

Weight

Equals mass times acceleration due to gravity

Inertia

Property of matter that resists changes in motion

Force

a push or pull on an object

Balanced force

Two equal forces acting on objects result in zero net force

Action/reaction force

Ex. Rocket launcher

Newtons laws

1. Inertia


2. Force=mass times acceleration


3. Action/reaction forces

Momentum

Product of mass times velocity

Work

Force must be in the direction of motion

Simple machines

Inclined plane,wedge,screw,pulley,lever,wheel and axle

Energy

Ability to do work

Potential

Stored energy

Kinetic

Energy of motion

Gravitational energy

Related to an objects height above ground,mass,and acceleration due to gravity

Potential energy

Example: an Apple falling from a tree at 9.8m/s 2

Thermal energy

Related to heat (warming and cooling)

Chemical energy

Stored in chemical bonds

Conservation of energy

Energy can not be created or destroyed, only converted from one form to another

Energy conservation

Energy can be converted from one form to another

Renewable energy

Can be replenished readily

Fossil fuels

Coal and oil deposits found underground

Nuclear fission

Used to create electricity in nuclear power plants by splitting atoms

Nuclear fusion

Produces the suns energy by combining atoms

Waves

All waves (both transverse and longitudinal) transfer energy

Longitudinal wave

Vibrates in a direction parallel to the motion, ex. Sound waves

Transverse wave

Vibrates in a direction perpendicular to the motion.

Mechanical waves

Require a medium (solids,liquids and gasses)

Period of wave

Time for one complete waveform to travel

Wavelength

Length of one complete waveform

Wave behavior

Reflection (bouncing back)


Refraction (bending)


Diffraction(around corners)

Wave interference

Constructive and deconstruction

Doppler effect

The closerr a sound the louder it appears

Electromagnetic waves

Radiation that can travel through space

Electromagnetic spectrum

Lists all the types of electromagnetic waves in order of wavelength and frequency

Charges

Unlike charges attract,likes repel

Turbine

Spins when driven by water or steam

Magnetism

Force that magnetic materials have- either attraction or repulsion

Poles

Like poles repel each other, opposite poles attract each other

Magnetic field

Area around magnet with strong force

Magnetic domain

Magnetic fields of atoms inside a magnet line up in the same direction

Demagnetize

Magnets can be demagnatized by heating or by striking with heavy blows

Breaking magnets

If broken in half: two new magnets form each with a new south and north pole

Electromagnetism

The relationship between electricity and magnetism

Electromagnet

Solenoid (coil) with ferromagnetic core

Ferromagnetic

Materials that are attracted to magnets

Earths layers

Starting from surface:



Crust


Mantle


Outer core


Inner core

Inner core

Made of a solid ball of dense metals