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If an object of mass 2 kg is lifted to a height of 10 meters, what is the work done against gravity? (Take g = 9.8 m/s²)
A. 196 J
B. 20 J
C. 9.8 J
D. 98 J
Answer: 196 J
What does the Work-Energy Theorem state?
A. Work done is equal to the change in kinetic energy.
B. Power is equal to the change in energy.
C. Energy is conserved in an isolated system.
D. Work done is equal to the change in potential energy.
Answer: Work done is equal to the change in kinetic energy.
What is the potential energy of an object of mass 10 kg elevated 5 meters above the ground? (Take g = 9.8 m/s²)
A. 490 J
B. 50 J
C. 98 J
D. 500 J
Answer: 490 J
If an object is moving with a constant velocity, what can be said about the work done by the forces acting on it?
A. The work done is zero.
B. The work done is equal to the force times distance.
C. The work done is equal to the change in kinetic energy.
D. The work done is equal to the power times time.
Answer: The work done is zero.
A machine does 500 J of work in 10 seconds. What is its power?
A. 50 W
B. 500 W
C. 5 W
D. 100 W
Answer: 50 W
What is the SI unit of energy?
A. Joule
B. Watt
C. Newton
D. Meter
Answer: Joule
Which energy transformation occurs when you lift an object against gravity?
A. Kinetic to Potential
B. Potential to Kinetic
C. Thermal to Mechanical
D. Mechanical to Thermal
Answer: Kinetic to Potential
What is the formula for calculating kinetic energy?
A. KE = 1/2 mv^2
B. KE = mgh
C. KE = Fd
D. KE = P/t
Answer: KE = 1/2 mv^2
The rate at which work is done is called:
A. Power
B. Energy
C. Work
D. Force
Answer: Power