Mechanical energy
Waves
Thermal energy
Energy transfer
Other
100
List two types of mechanical energy
Kinetic, potential
100
What type of wave travels in a direction perpendicular to the movement of the particles it is moving through?
transverse
100
Thermal energy moves from where there is ___________ to where there is ____________
more, less
100
What force causes all energy transfers to be less than 100% efficient?
friction
100
What is one unit that we could use to measure energy?
Joule, calorie, etc
200
How much potential energy does a 1kg object sitting on a ledge 10m off the ground have?
GPE= mgh
1kg x 9.8 x 10m =980 Joules
200
Which wave has a larger amplitude?
Bottom wave
200
Which pan would heat up faster an Aluminum pan with a specific heat of .9 or a copper pan with a specific heat of .37?
copper
200
Wind turning a windmill is an example of _____________ being transformed into ___________
kinetic, electric
200
Which will have more kinetic energy, a 10 kg dog running at a speed of 3m/s or a 2kg cat, shot out of catapult at a speed of 10m/s?
flying kitty
300
How much kinetic energy does a 1kg object traveling at a speed of 4m/s have?
KE=1/2 x m x v2
.5 x 1kg x (4x4)=8 Joules
300
Which wave has a higher frequency?
bottom wave
300
sitting on a cold rock and eventually feeling cold is an example of what kind of heat transfer?
conduction
300
A lightbulb is an example of ___________ energy being transformed into ___________
electric, electromagnetic/thermal
300
How can we increase the potential energy of an object?
increase it's mass or increase the height
400
How much potential energy does a bow, with a spring constant (k) of 4 that is pulled back 1m have?
2 Joules
400
Which property of a sound wave is perceived as the pitch of the sound
frequency
400
What kind of heat transfer causes the upstairs of a house to be warmer than the downstairs?
convection
400
A waterfall turning a waterwheel is an example of ________ being transformed into _________ and then into __________
potential, kinetic, electric
400
A 100g object absorbs 1400J of energy when it changes temperature by 10C. What is its specific heat?
Q=mxcx∆T
1400J= 100g x c x 10
1400/1000= c
c=1.4 J/g*C
500
If a bow produces 80 joules of potential energy, how fast will a 1kg projectile travel once it is released?
PE =KE
KE=1/2 x m x v2
80J=.5 x 1kg x v2
160=v2
4m/s=v
500
How fast is a wave with a frequency of 100hz and a wavelength of 2 meters traveling?
200m/s
500
How much thermal energy is absorbed by 100g of water (specific heat=4.184) when it is warmed by 10C?
Q=mxcx∆T
Q=100g x 4.18 x 10
Q=4,184J
500
Friction transforms _______________ energy into ____________.
kinetic, thermal
500
Transformations of energy always results in an increase in __________
disorder
the chaos of the universe