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Vocabulary
Concepts
Equations
Applying Equations
Wild Card
100
What term means the quantity of force times distance; the result of machines performing tasks? A. Force B. Power C. Work
Correct Response: C. Work - is the quantity of force times distance; the result of machines performing tasks.
100
As a car is slowing down, most of its kinetic energy is converted by the brakes to: A. Potential Energy B. Electrical Energy C. Thermal Energy
Correct Response: Thermal Energy
100
What does this equation mean? P = W/t
Correct Response: Power equals Work divided by time
100
How much power is necessary to do 100 joules of work in 10 seconds? A. 1 Watt B. 10 Watts C. 10,000 Watts
Correct Response: B - 10 Watts (Remember: Power equals work divided by time)
100
What is the potential energy of a 10 kg ball that is sitting on the ground? A. 10 Joules B. 0 Joules C. 15.0 Joules
Correct Response: B - 0 Joules
200
What is the rate at which work is done? A. Radiation B. Power C. Joule
Correct Response: B. Power - is the rate at which work is done.
200
Exercise may transform the chemical energy in your food into: A. Potential Energy B. Kinetic Energy C. Both Potential and Kinetic Energy
Correct Response: C. Both Potential and Kinetic Energy
200
What is the equation for calculating WORK?
Correct Response: W = Fd (Work equals Force times distance)
200
Calculate the work needed to lift a block weighing 7 newtons a distance of 100 meters: A. 107 Joules B. 350 Joules C. 700 Joules
Correct Response: C. 700 Joules (Work = Force times distance)
200
When a ball is thrown in the air, the potential energy gained must come from its kinetic energy. As the ball gains potential energy, its speed will: A. Stay the same B. Decrease (become less - slow down) C. Increase (become more - speed up)
Correct Response: B - Decrease or slow down
300
What is a fundamental building block of the universe; it appears in different forms and can travel in different ways? (Hint: chemical, radiant, and electrical are different types of this.)
Correct Response: Energy
300
Efficiency is usually expressed in what? A. Joules B. Percent C. Watts
Correct Response: Percent
300
What equals half the mass times the velocity squared? ? = 1/2m(v^2)
Correct Response: Kinetic Energy
300
If a ball with a mass of 3 kg and another with a mass of 5 kg are both sitting at the top of a hill, which one has more potential energy? A. They have the same potential energy B. The 3 kg ball C. The 5 kg ball
Correct Response: C. The 5 kg ball has more potential energy.
300
Potential energy is energy due to what? A. the temperature of an object B. the motion of an object C. the height of an object
Correct Response: C - the height of an object
400
What is Kinetic Energy?
Correct Response: Kinetic Energy is energy that comes from motion.
400
While sitting next to a campfire, Manuel noticed several different forms of energy being transformed from the potential energy of the wood. He correctly named all of the following forms EXCEPT: A. Nuclear B. Heat C. Light
Correct Response: A. Nuclear
400
A blender uses 200 joules of electrical energy every second. Due to friction and other causes, the energy available to spin the blades is reduced to 100 joules per second. The efficiency of the blender is: A. 90% B. 50% C. 10%
Correct Response: B. 50%
400
A motor does 7,000 joules of work in 10 seconds. What is the power of this machine? A. 70,000 watts B. 27 watts C. 700 watts
Correct Response: C. 700 watts
400
What is another name for Electromagnetic Energy?
Correct Response: Radiant Energy or Light Energy
500
In Science, how is work defined? (Hint: Include formula and direction)
Correct Response: In Science, work is defined as force multiplied by the distance moved in the direction with the force.
500
Miss Allnutt claims to have invented a perpetual motion machine that has an efficiency of 125%. You tell her this is impossible because it violates what? (Hint: Name the scientific law that makes this impossible.)
Correct Response: Law of Conservation of Energy
500
What is the kinetic energy of a 4,000 kg boat moving at 5 m/s? (Hint: Ek = 1/2m(V^2)
Correct Response: 50,000 Joules
500
Suppose a 200 Newton force is used to push an object a distance of 5 meters in 10 seconds. Find the work AND power. (Hint: W = Fd and P = W/t)
Correct Response: Work = 1,000 joules and Power = 100 watts
500
The efficiency of a bicycle is 80%. If you exert 200 joules in pedaling the bike, what is the work output? (Hint: Output work divided by Input work = machine efficiency)
Correct Response: 160 Joules