Vocabulary
A push or a pull
force
A diver on top of a diving board is an example of ______________________ energy.
potential energy
Two students who are similar in size walk up the same set of stairs. They are doing _________________ amount of work.
the same!
The two factors of power are work and ________________.
time.
What is the speed of light in a vacuum?
3x108 m/s
Stored energy
potential energy
A car rolling down a hill is an example of _____________________ energy.
kinetic energy
Work = ____________________ x ___________________
FORCE x DISPLACEMENT
Power is measured in _____________________.
watts.
What is the speed of sound in air at 80F?
347 m/s or 347.02 m/s
The units of force
newtons
A person skiing down a slope is ______________________ potential energy, and ____________________ kinetic energy.
losing potential energy and gaining kinetic energy
Holding a stack of books - work or not?
not doing work
The _________________ amount of time it takes to do work, the more power is produced.
shorter
What visible spectrum has the highest frequency
violet
the combination of 2 or more simple machines working together
compound machine
The unit of energy
joules
Pushing against a wall is an example of doing work. True/False
false - not moving over a distance!
Two cars that weigh the same race up the hill. Car 1 gets there twice as fast as Car 2. Which car had more power?
car 1
It the bending of wave as it hits a medium
refraction
How much work is performed in a certain amount of time
power
The definition of energy.
the ability to do work
How much work is done if a 50kg mass is lifted at the height of 2m
980 J
A lift generates a power rating of 1,500w. How high does a 890kg crate will be in 1.6s?
0.28 m
A hiker shouted "hello" on top of a cliff, after 1.5 s he heard his echo. Supposed that the temperature is 50F, how far did the sound travel before it bounced back to the hiker?
252.75 m