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The mechanical advantage of a simple machine is defined as:
A. The ratio of output force to input force
B. The ratio of input work to output work
C. The ratio of input power to output power
D. The ratio of input energy to output energy
Answer: The ratio of output force to input force
Which of the following equations represents the work done on an object?
A. W = F × d
B. W = m × v
C. W = m × g
D. W = 1/2 × m × v^2
Answer: W = F × d
What happens to the kinetic energy of an object if its velocity is doubled while its mass remains constant?
A. It doubles
B. It quadruples
C. It remains the same
D. It halves
Answer: It quadruples
If a system’s total energy remains constant, which of the following is true?
A. Energy is conserved
B. Energy is destroyed
C. Energy is created
D. Energy changes into different forms
Answer: Energy is conserved
Which of the following is a form of energy transformation?
A. Chemical to Mechanical
B. Mechanical to Electrical
C. Electrical to Thermal
D. All of the above
Answer: All of the above
The work done in lifting an object to a height is equal to the object’s:
A. Kinetic energy
B. Elastic potential energy
C. Gravitational potential energy
D. Thermal energy
Answer: Gravitational potential energy
The power of a motor that does 1500 J of work in 25 seconds is:
A. 60 W
B. 75 W
C. 80 W
D. 100 W
Answer: 60 W
A 5 kg object is dropped from a height of 10 meters. What is its potential energy before it starts to fall? (Take g = 9.8 m/s²)
A. 490 J
B. 50 J
C. 98 J
D. 500 J
Answer: 490 J
Which of the following describes the work-energy theorem?
A. Work done on an object equals the change in its kinetic energy
B. Work done on an object equals its potential energy
C. Energy is conserved in an isolated system
D. The force applied to an object equals the change in its momentum
Answer: Work done on an object equals the change in its kinetic energy