#1
Which of the following is a unit of work?
Joule
ExplanationJoule is the SI unit of work.
#2
Which of the following statements is true about kinetic energy?
It depends on an object's speed.
ExplanationKinetic energy is dependent on an object's speed.
#3
Which of the following is a unit of power equivalent to one joule per second?
Watt
ExplanationThe Watt is the unit of power, defined as one joule per second.
#4
Which type of energy is associated with the motion of an object?
Kinetic energy
ExplanationKinetic energy is associated with the motion of an object.
#5
What is the unit of work and energy equivalent to one newton meter?
Joule
ExplanationThe unit of work and energy equivalent to one newton meter is the Joule.
#6
Which law of thermodynamics states that energy cannot be created or destroyed?
First Law
ExplanationThe First Law of Thermodynamics states that energy is conserved; it cannot be created or destroyed.
#7
What is the SI unit of power?
Watt
ExplanationThe SI unit of power is the Watt.
#8
Which of the following is a conservative force?
Gravity
ExplanationGravity is a conservative force, as the work done by gravity is independent of the path taken.
#9
Which of the following equations represents the work-energy theorem?
W = ΔKE
ExplanationThe work-energy theorem is represented by the equation W = ΔKE, where W is work done and ΔKE is the change in kinetic energy.
#10
Which of the following statements is true about the work done by a constant force?
Work done can be positive or negative depending on the direction of the force
ExplanationThe work done by a constant force can be positive or negative based on the direction of the force relative to the displacement.
#11
A force of 50 N is applied to an object to move it 10 meters. How much work is done?
500 J
ExplanationWork done is calculated as force times distance: 50 N * 10 m = 500 J.
#12
What is the potential energy of a 2 kg mass raised to a height of 5 meters? (g = 9.8 m/s²)
98 J
ExplanationPotential energy is calculated as mgh, where m is mass, g is gravitational acceleration, and h is height: 2 kg * 9.8 m/s² * 5 m = 98 J.
#13
What happens to the kinetic energy of a falling object as it approaches terminal velocity?
It remains constant
ExplanationAs an object reaches terminal velocity, its acceleration and, consequently, its increase in kinetic energy, approach zero, resulting in a constant kinetic energy.
#14
What is the work done by a force acting perpendicular to the direction of motion?
Zero work
ExplanationWhen a force is perpendicular to the direction of motion, no work is done.
#15
Which law of thermodynamics states that entropy of a system approaches a constant value as the temperature approaches absolute zero?
Third Law
ExplanationThe Third Law of Thermodynamics states that the entropy of a system approaches a constant value as the temperature approaches absolute zero.