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robbie's study stack
Question | Answer |
---|---|
What is a wave? | The vibrations of a medium |
What is a medium? | the material which a wave can travel through |
What is a transverse wave? | when particles move perpendicularly to the direction the wave travels |
What is a crest? | the point where the wave is highest |
What is a trough? | the point where the wave is lowest |
What is a longitudinal wave? | when particles move in the same directions as the wave travels |
What is a compression? | when an item compresses together |
What is a rarefaction? | when an item is spread apart |
What are mechanical waves? | waves that require a medium |
What are electromagnetic waves? | vibrations of electric and magnetic fields |
What is amplitude? | the measure of how far particles in the medium move |
What is a wavelength? | distance from any point on a wave to the next identical point |
What is the definition of frequency? | number of waves that pass a point in a given amount of time |
What is wave speed? | the speed waves travel |
What is the equation for wave speed? | speed =distance/time |
What is force? | push or pull exerted on an object |
What is the unit for force? | newton's |
What is work? | use of force to move something |
What is the unit and equation for work? | joules, work=force times distance |
What is power? | the rate at which work is done |
What is the equation for power? | power=work/time |
if 420 joules of work are needed to move a small dog a distance of 2 meters what is the weight of the small dog? | the small dog weighs 210 newton's |
if a person weighing 200 N gets on an elevator. the elevator lifts the person 10 feet in 20 seconds, how much power was used? | 100 watts of power was used to lift the person |
What type of wave is sunlight? | electromagnetic waves |
A guitar is being played, what type of wave is it? | electromagnetic wave |
what type of wave is firelight? | mechanical wave |
what type of mechanical energy does an object have when you lift it? | potential energy |
the mechanical energy of a non moving arrow is mostly ___________ energy. | potential |
work is the product of a __________ applied to an object and the distance the object moves with or against the force. | force |