How do I decide if there is work done on an object?
There must be a force acting AND a distance that the object moves because of that force.
100
How do I decide if an object uses power?
If there is work done, power is used. Work is done when there is a force AND a distance moved.
100
What is the frequency of a wave with a period of 4 s and a wavelength of 6 m?
f = 1/T = 1/2s = .25 s
100
What is the name for the time for one wave?
Period
100
What is the name for the distance of one wave?
Wavelength
200
What is the difference between Kinetic Energy and Gravitational Potential Energy?
Kinetic energy has to do with motion (speed); Gravitational Potential Energy has to do with how high something is from the ground.
200
How are power and time related?
They are inversely proportional.
200
A 6 kg object rolls down a 5 meter tall hill starting from rest. At the bottom it has a velocity of 9.9 m/s. What is the potential at the end?
Ug = mgh = 6kg*9.8m/s^2*5m = 294 J
K = 1/2*m*v^2 = 1/2*6kg*(9.9m/s)^2 = 294 J
200
Which kind of wave has particles that move PARALLEL to the energy of the wave?
Which kind of wave has particles that move PERPENDICULAR to the energy of the wave?
Longitudinal
Transverse
200
What is a medium?
Any material (matter) that a wave can travel through.
NOT a vacuum.
300
I do 50 Joules of work over a certain distance.
If I double the distance and apply the same force, how much work do I do?
100 J
300
Give an example of one kind of energy being transformed into another.
(Dependent upon group)
300
What is the speed (velocity) of water waves that are 8 meters apart and hit the shore every 4 seconds?
v = lambda/T = 8m/4s = 2 m/s
300
What is the name of the part of a standing wave that does NOT move?
Nodes
300
What is the name for the phenomenon that occurs when two waves come together to form one big wave?
What is the process of mathematically adding those waves called?
Interference
Superposition
400
What kind of energy is used when I stretch my hair band?
Elastic Potential Energy
400
What kind of energy is represented by the heating of water on my stove?
Thermal
400
What is they frequency of a sound wave that has a wavelength of 2 meters and a speed (velocity) of 340 m/s?
f = v/lambda = (340m/s)/2m
400
A 5 meter crest meets a 7 meter crest. What kind of wave is formed (How tall/deep? Crest/trough?) What kind of interference is this?
12 meter crest
Constructive
400
What is the difference between wavelength and period?
Wavelength is the *DISTANCE* for one wave.
Period is the *TIME* for one wave.
500
What kind of energy is used by the sun? What TWO kinds are produced?
Nuclear is used. Thermal and electromagnetic are created.
500
Describe Conservation of energy in your own words.
Energy cannot be created or destroyed. It can only be transferred between objects or transformed into different types.
500
What is the kinetic energy of a 4 kg turtle that is riding on a wave with a frequency of 3 Hz and a wavelength of 2 meters?
v = f*lambda = 3Hz*2meters = 6 m/s
K = 1/2*m*v^2 = 1/2*4kg*(6m/s)^2 = 72 J
500
What is the name for a wave that requires a medium?
What is the name for a wave that does not require a medium?
Mechanical
Electromagnetic
500
What color, red or violet, has the highest frequency? (Hint: it also has the shortest wavelength)