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What happens to the kinetic energy of an object when its velocity doubles?
A. It doubles
B. It quadruples
C. It remains the same
D. It halves
Answer: It quadruples
The energy associated with the motion of an object is called:
A. Potential energy
B. Kinetic energy
C. Chemical energy
D. Electrical energy
Answer: Kinetic energy
If a car engine does 5000 J of work in 100 seconds, what is its power output?
A. 50 W
B. 500 W
C. 5000 W
D. 5 W
Answer: 50 W
What is the formula for calculating power?
A. P = W/t
B. P = Fd
C. P = mgh
D. P = 1/2 mv^2
Answer: P = W/t
How much work is done if a force of 25 N is applied to move an object 10 meters horizontally?
A. 250 J
B. 10 J
C. 25 J
D. 100 J
Answer: 250 J
In a closed system, which law states that energy cannot be created or destroyed?
A. Law of Conservation of Energy
B. Newton's First Law
C. Newton's Second Law
D. Law of Universal Gravitation
Answer: Law of Conservation of Energy
The work done by gravity is given by the formula:
A. W = mgh
B. W = Fd
C. W = 1/2 mv^2
D. W = P/t
Answer: W = mgh
Which of the following energy transformations occurs in a bouncing ball?
A. Kinetic to Potential
B. Potential to Thermal
C. Kinetic to Thermal
D. Potential to Kinetic
Answer: Potential to Kinetic
What is the power output of a motor that does 2000 J of work in 50 seconds?
A. 40 W
B. 100 W
C. 20 W
D. 50 W
Answer: 40 W