Energy Concepts
The ability to do work is what we call ______; two examples are gravitational potential and kinetic
energy!
Is energy a scalar or a vector quantity?
How is kinetic energy calculated?
KE=1/2mv2
A cool cat with a mass of 1.2 kg climbs to the top of a 2 m tall scratching post. Using g = 10 m/s², how much gravitational potential energy (GPE) does the kitten have at the top?
24 J of GPE.
Which soccer superstar joined the Saudi Arabian club Al Nassr in January 2023, after leaving Manchester United?
Cristiano Ronaldo
Energy is measured in ______. (What are the units for energy?)
Joules.
If you imagine a drop of water about to fall down a waterfall, at the top of the waterfall the drop of water has this kind of energy.
Gravitational potential Energy
How is gravitational potential energy calculated?
A soccer ball (mass = 0.5 kg) is kicked by Kenny such that it travels at 8 m/s. Using the formula KE = (1/2) mv², how much kinetic energy does the ball have?
16 J.
Which K-pop group set a Guinness World Record in 2022 for the most Twitter engagements (likes/retweets) for a music group?
BTS
Which of the following is NOT a type/flavor of potential energy?
Gravitational, Kinetic, or Elastic
Kinetic (energy)
Energy can not be created or destroyed, only changed into a different form or forms of energy. This is known as the _______
Law of Conservation of Energy.
How is elastic potential energy calculated?
EPE = 1/2kx2
A pogo stick spring has a stiffness (k) of 150 N/m. Daniel uses it and compresses the spring by 0.02 m. Calculate the elastic potential energy (EPE).
Please use EPE = (1/2)kx².
0.03 J.
Which Netflix series about a teenage Addams Family character broke records in 2022 for most hours viewed in a single week for an English-language series?
Wednesday
List all three types of mechanical energy.
2. KE
3. EPE
Kinetic energy depends on what "factors?"
In other words, what "variables" are involved for calculating the kinetic energy of something?
the mass and velocity of an object
Please calculate the elastic potential energy of twiddler with stiffness of 200 N/m that is compressed 0.03 m.
0.09 J.
A basketball hoop is 3 m high. Suppose an adorable koala climbs onto the rim and has 90 J of GPE (relative to the ground). If we're here on Earth where g = 10 m/s², what is the koala’s mass?
mkoala = 3 kg
Which 2023 Marvel sequel starring Paul Rudd introduced Jonathan Majors as the villain Kang the Conqueror?
Quantumania
What happens to the gravitational potential energy and the kinetic energy of a skateboarder as she drops into a halfpipe?
GPE is changed/transformed/converted to KE.
Music coming from the radio, your loud vacuum cleaner, people talking on tv are all examples of this type of energy.
Sound energy
A 6 kg cute raccoon is running 2 m/s. Then, he doubles his speed/velocity.
1. How fast is he running now?
2. Did his kinetic energy double? Triple? Quadruple?
1. His new speed/velocity is 4 m/s.
2. His kinetic energy quadruples! From 12 J to 48 J.
A puppy chases a tennis ball of mass 0.4 kg that has 20 J of kinetic energy. Using KE = (1/2) mv², can you find the ball’s velocity.
v = 10 m/s
Which well-known actor provided the voice for Knuckles in the 2022 film Sonic the Hedgehog 2?
Idris Elba