Show:
Vocab, Vocab, Vocab
WORKing hard? Need a POWER-up?
PE/KE & the Conservation of Energy
Is it cold in here, or am I just warmer?
Potent Potables
100
Energy in the form of motion.
What is Kinetic Energy?
100
Gabe pushes a block 4 m with a force of 24 N. How much work is done?
What is 96 J.
100
The KE of an object increases as its ______ and/or ______ increases?
What is its mass and/or velocity?
100
The amount of energy it takes to raise the temperature of 1 kg of a material 1 degree C is called what?
What is the Specific Heat?
100
A book sliding across a horizontal table slows down and comes to a stop. The book's kinetic energy was converted into what form of energy?
What is Thermal Energy?
200
The transfer of energy through motion.
What is Work?
200
Your mom (lol) holds your newborn brother with a weight of 40 Newtons above her head for 10 seconds. How much work is being done holding your baby brother up?
0 J
200
Where during its swing does a pendulum have the highest amount of PE? Where does it have the most KE?
Highest PE = Greatest height, Highest KE = Lowest height (middle of swing)
200
Which has the greater amount of thermal energy- one liter of water at 50 C or two liters of water at 50 C? Why?
Two liters- it has more mass.
200
A roller coaster is at the top of a hill and rolls to the top of a lower hill. If the mechanical energy is constant, then on the top of which hill is the kinetic energy from the roller coaster's motion greater? Why?
Lower hill- due to the lower height, more of the original PE has changed into KE.
300
Energy may change form but it cannot be created or destroyed.
What is the Law of Conservation of Energy?
300
Jabroni Jones hit a 125 meter grand slam during a baseball game. He did 3000 Joules of work. His bat was in contact with the ball for 0.20 meters. With what force did he hit the ball?
What is 15,000 Newtons.
300
You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. Calculate the ball's kinetic energy.
What is 945 J.
300
How much heat must be absorbed by a .75 kg pot of water in order to raise the temperature from 20 C to 30 C? The specific heat of water is 4186 J/kg*C.
What is 31,395 J.
300
Friction causes Mechanical Energy to be changed into what form?
What is Thermal Energy?
400
The energy that flows from something with a higher temperature to something with a lower temperature.
What is Heat?
400
Explain how the everyday meaning of "work" differs from its scientific meaning.
In everyday use, the term work refers to a person's occupation, or what a person does to earn a living. To a scientist, work is the transfer of energy through motion. Thus, a person's occupation would only be considered work by a scientist when the person is applying a force to move an object through a distance.
400
What is the potential energy of a 3 kg ball that is on the ground?
What is 0 J.
400
A 1.25 kg piece of aluminum absorbs 202,500 J of heat energy, and its temperature changes from 20 C to 200 C. Calculate the specific heat capacity of aluminum.
What is 900 J/kg*C.
400
Identify which of the following is(are) a form of mechanical energy: elastic potential energy, chemical potential energy, gravitational potential energy, thermal energy.
What are elastic potential energy and gravitational potential energy.
500
A measure of the average kinetic energy of particles in a sample of matter.
What is Temperature?
500
Being a straight up boss, Mr. Rupp can bench press 220 kg from 0.7 m from the ground to 1.5 m above the ground. How much power did Mr. Rupp use if he lifts the weights in 10 seconds?
What is 172.48 Watts.
500
Calculate the speed of a 5.2 kg object that possesses 26.1 J of kinetic energy.
What is 3.17 m/s.
500
What mass of water will change its temperature by 5 C when 5,232.5 J of heat is added to it? The specific heat of water is 4186 J/kg*C.
What is 0.25 kg.
500
What three things does the amount of Thermal Energy depend on?
1) Type of Substance, 2) Amount of mass, 3) Temperature