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Energy Transformations
Kinetic vs Potential Energy
Conservation of Mechanical Energy
Energy, Work and Power
Wild
100
Energy is defined as... A) Any driving force B) The ability to do work C) The power to create a force D) Anything that conatins sugar or carbohydrates
What is the ability to do work (B)
100
The higher an object is above the earth the more _____ energy it contains. A) Mechanical B) Kinetic C) Aerodynamic D) Potential
What is potential (D)
100
True or False: The total amount of energy in the universe is constant.
What is True
100
Which of the following equations is correct? A) Force = Work X Distance B) Work = Force X Distance C) Distance = Force + Work D) Work = Force + Distance
What is Work = Force X Distance (B)
100
A force of 10 newtons is used to push a 5-kilogram object a distance of 18 meters. What is the amount of work exerted on the object? A) 50 joules B) 90 joules C) 180 joules D) 900 joules
What is 180 joules (C)
200
What type of energy does a moving car have A) Chemical energy B) Potential energy C) Thermal energy D) Kinetic energy
What is kinetic energy (D)
200
Give an example of kinetic energy.
Answers may vary.
200
All energy transformations require _______ and _______. A) high and low B) an inupt and an output C) increased energy and decreased energy D) a gain of energy and a loss of enrgy
What is an input and an output (B)
200
Determine the amount of work done by a person who uses a 25.0 newton force to push a shopping cart 10 meters, if W=FXD.
What is 250 joules.
200
An elevator does 12,000 joules of work in 6.0 seconds. What is the power used by the elevator? A) 2,000 watts B) 3,000 watts C) 18,000 watts D) 72,000 watts
What is 2,000 watts (A)
300
A student burns a piece of steel wool in science class. The steel wool releases thermal energy as it burns. Which type of stored energy is transformed into thermal energy during this process? A) mechanical B) electromagnetic C) nuclear D) chemical
What is chemical energy (D)
300
Which has a greater potential energy, a ball held above a student's head, or a ball thrown horizontally at 100 mph by the same student?
What is a ball held above a student's head.
300
The amount of total energy in a system can be found by adding the ________. A) All potential energy B) The thermal and chemical energy C) The kinetic and potential energy D) The mechnical and electromagnetic energy
What is the kinetic and potential energy (C)
300
A woman in a supermarket check-out line uses 22 newtons of force to lift a bag of potatoes 0.50 meters up from her shopping cart. How much work did she do on the potatoes? A) 44 joules B) 22.5 joules C) 15 joules D) 11 joules
What is 11 joules (D)
300
The four fundamental forces of the universe determine how particles interact with each other. Which of the following correctly lists the fundamental forces in order from strongest to weakest? A) strong nuclear, gravitational, electromagnetic, weak nuclear B) weak nuclear, strong nuclear, gravitational, electromagnetic C) strong nuclear, electromagnetic, weak nuclear, gravitational D) gravitational, weak nuclear, strong nuclear, electromagnetic
What is strong nuclear, electromagnetic, weak nuclear, gravitational (C)
400
Which statement correctly describes chemical energy? A) Chemical energy is energy stored in the bonds between atoms. B) Chemical energy is the kinetic energy of moving and vibrating molecules. C) Chemical energy is the result of mass converted to energy in the nucleus of an atom. D) Chemical energy is energy in the form of heat.
What is energy is energy stored in the bonds between atoms (A)
400
During recess, a student shoots a basketball. During this process, chemical energy in the student is transformed primarily into which forms of energy in the ball? A) first kinetic energy and then heat B) first potential energy and then heat C) first kinetic energy and then potential energy D) first potential energy and then kinetic energy
What is first kinetic energy and then potential energy (C)
400
The total energy in a system is 2000 joules. The potential energy is equal to 750 joules. What is the kinetic energy? A) 250 J B) 750 J C) 1250 J D) 2000 J
What is 1250 J (C)
400
A crane lifts a 750-N stack of wood a distance of 10 meters. It accomplishes this feat in 3 seconds. Calculate the power of the crane, if P = W/T. The units MUST be correct in order to receive credit for this answer.
What is 2500 watts.
400
What would most likely be learned from researching famous scientists who have studied the role of energy in different situations throughout history? A) how energy theories have changed over time B) how to organize the data collected in a heat of fusion experiment C) how ideas about energy are going to change over the next century D) how to set up an experiment to calculate the energy of someone climbing stairs
What is how energy theories have changed over time (A)
500
The solar wind is a stream of charged particles flowing from the Sun out through the solar system. These particles release energy as they are slowed by fields around the Earth. What form of energy is released by these slowing charged particles? A) chemical B) nuclear C) thermal D) electromagnetic
What is electromagnetic energy (D)
500
Draw a picture of a pendulum and label the points of highest and lowest potential energy. Bonus: How can you represent kinetic energy in your picture?
See board
500
The kinetic and potential energy in a system are equal. The total energy of the system is equal to 1246 joules. What is the potential energy of the system?
What is 623 joules.
500
During a strength and fitness contest, each participant must move 100 fifty-kilogram weights from the floor to a shelf 1 meter above the floor. The participant with the fastest time wins the contest. If all the participants finish the task, which statement is true about the winner compared with the rest of the participants? A) The winner used more power but did less work. B) The winner used more power and did the same amount of work. C) The winner used the same amount of power but did more work. D) The winner used less power but did the same amount of work.
What is the winner used more power and did the same amount of work (B)
500
Radon is a radioactive gas that can cause cancer. It is formed by the radioactive breakdown of uranium in soil, rocks, and water. Many houses in the United States have elevated radon levels. Which source is the least likely cause of elevated levels of radon in a house? A) an open window B) cracks in a basement floor C) running water D) gaps around underground pipes
What is cracks in a basement floor (B)