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SFHS Phy Sci Final


An ambulance siren sounds different as it approaches you then when it moves away from you. What scientific term would you use to explain how this happen? doppler effect
What does the prefix kilo- mean? 1000
An object that is accelerating may be : a. speeding up b. slowing down slowing down
When opposite poles of two magnets are brought together, the poles: a. attract b. repel attract
The force that keeps an object moving in a circle is called __________ _______ centripetal force
What is the unit of work? Joule
What's the SI unit of power? watt
What's the SI unit of force? newton
What type of friction occurs as a fish swims through water? fluid friction
Your weight equals your ______________________________ mass times the acceleration due to gravity
Energy of motion is called __________ ___________ kinetic energy
What does the law of conservation of energy state? energy can be converted from one form to another but energy cannot be created and cannot be destroyed
What is a drawback of solar energy? it depends on the climate
What is a unit of temperature? Celsius
How does energy from the sun reach the Earth? radiation
What material conducts heat well? metal
What do electric forces between charges depend on? quantity of charge involved & how far apart the charges are
What happens if an atom gains electrons? it becomes negatively charged
Walking on carpet is an example of charge being transferred by ____ induction
What type of current is produced by a battery? direct current
What 3 things affects resistance? thickness, length, & temperature
What type of current is found in your school? alternating current
What are 3 things that provide electrical safety? 1)circuit breaker 2) fuse 3) ground-fault circuit interrupter
When a surfer rides an ocean wave on her surfboard, she is actually riding on a _______________________ crest that's toppling over
What is speed? speed is the ratio of the distance an object moves to the amount of time needed to travel the distance
What type of speed is measured at a particular instant? instantaneous speed
The slope of a line on a distance-time graph is______ speed
What does a horizontal line on a distance-time graph represent? the object is moving at a constant speed
What is the rate at which velocity changes? acceleration
The following example identifies a change in motion that produces _______: Example: a ball moving at a constant speed around a circular track acceleration
A machine is a device that can multiply _________ force
An ax is an example of a _________ wedge
What does the power of a machine measure? its rate of doing work
The gravitational force between two objects increases as mass ____ or distance decreases. increases
In order for work to be done, it must produce ________ across a distance movement
How many watts are in1 horsepower motor? 750-W
Work is a transfer of ____ energy
What's an example of a compound machine? bicycle
What's the SI unit for pressure? pascal
Why is the efficiency of a machine always less than 100 percent? some work input is lost to friction
The property of matter that resists change in motion is called ________ inertia
Which of the universal forces is the weakest? gravitational
What does Newton's third law of motion describe? action and reaction forces
Matter is needed to transfer thermal energy by _______ & _________ conduction and convection
What are 3 things the first law of thermodynamics applys to? 1) heating objects 2) transferring thermal energy 3) doing work on a system
What causes projectile motion? the downward force of gravity and initial forward velocity
What force is responsible for the repulsion between 2 positively charged particles? electric
According to Newton's second law of motion, the acceleration of an object equals the net force acting on the object divided by the object's _______. mass
A train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train's acceleration be described? The train's acceleration is negative
An open parachute increases air resistance of a falling sky diver by increasing the ___________ surface area
What universal force acts only on the protons and neutrons in a nucleus? strong nuclear
An orange might roll off your cafeteria tray when you stop suddenly because of the orange's _____ inertia
What happens when an unbalanced force acts on an object? the object accelerates
The product of an object's mass and velocity is its _______ momentum
What does the strength of an electric field depend on? 1)amount of charge that produced the field 2) distance from the charge
What is Ohm's law? V= I x R
What is the unit of electric power? watt
List 3 examples of objects with elastic potential energy? 1) a wind up toy that has been wound up 2) a compressed basketball 3)a stretched rubber band
The energy stored in gasoline is what type of energy? chemical energy
Walking converts what type of energy into mechanical energy? chemical
What does thermal energy depend on? 1)mass 2) phase (solid, liquid, gas) 3) temperature
Nuclear power plants are designed to convert nuclear energy into what type of energy? electrical
Solar cells convert what type of energy into electrical energy? electromagnetic
What does a calorimeter directly measure: temperature change
As the temperature of an object rises, so the the ___________ thermal energy
What is biomass energy? the chemical energy stored in living things
Heat is the transfer of thermal energy from one object to another because of the difference in __________ temperature
The pitch of a sound is most closely related to the ______________ frequency of vibrations
The frequency of a sound wave determines the ______ of the sound pitch
A mechanical wave requires a medium. What can that medium be? a solid, liquid, or gas
________ refers to an effect in which the vibration of one object causes another object to vibrate at natural frequencies. resonance
Sound travels fastest in _____ water
When a sound wave strikes your eardrum, it causes forced vibrations that are transferred to the _____, ____, and ____ hammer, anvil, stirrup
The structure within the cochlea containing hair cells that vibrate at different natural frequencies is the _____________ basilar membrane
How does a sonar system measures the distance? by determining the time it takes for sound waves to bounce off a surface
How does an ultrasound produce images of body structures? because sound waves travel at different speeds through materials of different densities
Transverse, longitudinal, and surface waves all need a source of _______ to produce it. energy
How do transverse and longitudinal waves both transfer energy? through a medium
What type of charges attract each other? opposite charges attract
What type of waves are sound waves? longitudinal waves
Sound waves require a _____ medium
A disturbance sends ripples across water in a tub. These ripples are an example of a _______ _______ surface wave
What type of electromagnetic wave has the greatest wave length? radio waves
A piano, violin, or guitar uses the resonance of a wooden soundboard to ________ the sound. amplify
Objects in free fall near the surface of the Earth experience _________ constant acceleration
Created by: dcrovato