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In a closed system, if the total mechanical energy is conserved, what is true about the kinetic and potential energy?
A. The sum of kinetic and potential energy remains constant
B. The sum of kinetic and potential energy decreases
C. The kinetic energy decreases while potential energy increases
D. The potential energy decreases while kinetic energy increases
Answer: The sum of kinetic and potential energy remains constant
The rate at which energy is transferred is known as:
A. Power
B. Energy
C. Work
D. Force
Answer: Power
What is the work done by a force of 25 N moving an object 8 meters horizontally?
A. 200 J
B. 150 J
C. 50 J
D. 100 J
Answer: 200 J
If a car has a mass of 800 kg and is traveling at a speed of 15 m/s, what is its kinetic energy?
A. 180,000 J
B. 120,000 J
C. 90,000 J
D. 60,000 J
Answer: 120,000 J
The amount of work done in stretching a rubber band is stored as:
A. Elastic potential energy
B. Kinetic energy
C. Gravitational potential energy
D. Thermal energy
Answer: Elastic potential energy
If the velocity of an object is halved, what happens to its kinetic energy?
A. It is reduced to one-fourth
B. It is reduced to one-half
C. It remains the same
D. It doubles
Answer: It is reduced to one-fourth
What is the power output of a machine that does 5000 J of work in 50 seconds?
A. 100 W
B. 200 W
C. 500 W
D. 1000 W
Answer: 100 W
Which of the following is not a form of energy?
A. Force
B. Kinetic energy
C. Potential energy
D. Thermal energy
Answer: Force
Which principle states that energy cannot be created or destroyed, only transformed from one form to another?
A. Law of Conservation of Energy
B. Work-Energy Theorem
C. Newton's First Law
D. Law of Universal Gravitation
Answer: Law of Conservation of Energy