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The work done by lifting an object can be calculated by:
A. W = m × g × h
B. W = F × d
C. W = 1/2 m × v^2
D. W = F × t
Answer: W = m × g × h
Which of the following is true for an ideal machine?
A. It has 100% efficiency
B. It converts all input energy into useful work
C. It has no friction
D. All of the above
Answer: All of the above
Which energy transformation occurs when you eat food?
A. Chemical to Kinetic
B. Chemical to Potential
C. Mechanical to Chemical
D. Thermal to Chemical
Answer: Chemical to Kinetic
The energy of an object in motion is known as:
A. Kinetic energy
B. Potential energy
C. Mechanical energy
D. Thermal energy
Answer: Kinetic energy
In which type of energy transformation does a battery-powered fan operate?
A. Chemical to Mechanical
B. Mechanical to Electrical
C. Chemical to Thermal
D. Electrical to Chemical
Answer: Chemical to Mechanical
A 100 kg object is lifted to a height of 5 meters. The work done is:
A. 5000 J
B. 1000 J
C. 500 J
D. 50 J
Answer: 5000 J
The gravitational potential energy of an object is dependent on:
A. Height above the ground
B. Its speed
C. The amount of force applied
D. The time taken to lift it
Answer: Height above the ground
The work done by a force of 15 N moving an object 4 meters is:
A. 60 J
B. 15 J
C. 4 J
D. 30 J
Answer: 60 J
The work done to overcome friction is converted into:
A. Heat energy
B. Kinetic energy
C. Potential energy
D. Chemical energy
Answer: Heat energy