881220
Description
Flashcards by Brian Hedspeth, updated more than 1 year ago
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Created by Brian Hedspeth
almost 10 years ago
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| Question | Answer |
| Speed is the rate of change in | distance |
| To describe velocity you need to know | speed and direction |
| When you graph the motion of an object, you put ____ on the horizontal axis and ____ on the vertical axis. | time, distance |
| Acceleration involves a change in ____. | Speed and Direction |
| On a speed-time graph, a horizontal line shows the change in speed is ____. | 0 |
| Inertia | An object's resistance to change in motion |
| If you exert a force on an object in motion you will change its ____. | momentum |
| The distance traveled divided by the time taken to travel the distance is ____. | speed |
| Momentum is a measure of ____. | how hard it is to stop an object |
| Normally, atoms are electrically neutral because there are ____. | equal numbers of protons and electrons |
| The buildup of electric charges on an object is called | static charge |
| A material through which electrons do NOT readily flow | insulator |
| Two objects will attract one another when they have ____. | opposite charges |
| An electric field gets stronger as you ____. | get closer to a charge |
| The separation of positive and negative charges due to electric field is called a(n) ____. | induced circuit |
| The steady flow of electrons through a conductor is ____. | an electric current |
| Copper is used in household wiring because ____. | it has a low resistance |
| When the resistance in an electrical circuit increases, the current flowing in the circuit ____. | decreases |
| Resistance is measured in a unit called the ____. | ohm |
| A path created for a current that allows only one route for the current is called a ____. | series circuit |
| The rate at which an electrical device converts energy from one form to another is called ____. | electrical power |
| What is the equation for the correct relationship among power, current and voltage? | P = I x V |
| a device designed to open an overloaded circuit and prevent overheating | circuit breaker |
| Electric companies usually sell electrical energy in units of ____. | kilowatt-hours |
| A circuit that has two or more separate paths for electrons to follow is a(n)____. | parallel circuit |
| The location of the strongest magnetic field is the ____. | magnetic poles |
| The region around a magnet where the magnetic forces act is the ____. | magnetic field |
| The aurora borealis is seen mainly ____. | near the poles |
| Particles in the solar wind react with ____ in the atmosphere to produce the aurora. | atoms |
| The function of an electric motor is to change ____. | electrical energy into mechanical energy |
| A current carrying wire wrapped around an iron ore is called a(n) ____. | electromagnet |
| Changing the current changes the ____ of an electromagnet. | strength and direction |
| The function of a generator is to change ____. | mechanical energy into electrical energy |
| A device that increases or decreases voltage in a power line is a ____. | transformer |
| Current that does not reverse direction is called ____. | direct current |
| A current that reverses direction in a regular pattern is called a(n) ____. | alternating current |
| In a step-up transformer, the number of turns of wire is greater in the ____ coil than in the ____ coil, and the ____ voltage exceeds the ____ voltage. | output, input, output, input |
| The amplitude of a compressional wave depends on the _____. | density of material in compressions and rarefactions |
| Which of the following correctly states the equation for calculating wave speed? | wave speed = wave length x frequency |
| The SI unit for frequency is the _____. | hertz |
| Sound waves produced by a vibrating object are _____. | compressional waves |
| Loudness is the human perception of sound wave _____. | intensity |
| The part of the ear that amplifies sound vibrations is the _____. | middle ear |
| The process of detecting objects by bouncing sounds off them is called _____. | echolocation |
| If the distance between the crest and trough of a wave is 1.2 m, the wave’s amplitude is _____. | 0.6 m |
| Sound intensity is measured in _____. | decibels |
| The brightness of a light is determined by _____. | intensity of light waves |
| The shortest radio waves are called _____. | microwaves |
| The electromagnetic waves with the highest energy are _____. | gamma rays |
| The “normal” is a line that makes an angle of _____. | 90 degrees |
| If the frequency of a sound wave is 7.0 Hz, and the sound wave travels through the air at a speed of 350 m/s, what is the wavelength? | 50 m |
| Light travels fastest in _____. | empty space |
| The intensity of light waves is a measure of the _____. | energy carried by the waves |
| As the frequency of a sound gets higher, so does its _____. | pitch |
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