Flashcards on Work, Energy, and Power
Work, Energy, and Power Explained for Students | Physics Guide
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Work and Energy
48 cards
Card 1
Question: What is the definition of energy in this context?
Answer: Energy is the ability to do work and is a scalar quantity associated with a system of objects.
Card 2
Question: List some forms of energy mentioned.
Answer: Kinetic, chemical, nuclear, thermal, electrostatic, gravitational (and other forms like spring potential).
Card 3
Question: State the defining characteristic of energy that makes it useful in physics.
Answer: Energy is always conserved.
Card 4
Question: What is kinetic energy and its mathematical expression?
Answer: Kinetic energy is the energy associated with the state of motion of an object. K = 1/2 m v^2.
Card 5
Question: What is potential energy and give two examples with formulas from the content.
Answer: Potential energy is stored energy that can be released as kinetic energy. Examples: gravitational potential energy U = m g h; spring potential energy
Card 6
Question: Define mechanical energy for a particle.
Answer: Mechanical energy E is the sum of kinetic and potential energies: E = K + U.
Card 7
Question: State the conservation of energy statement given for mechanical energy.
Answer: The mechanical energy of a particle stays constant unless external or non-conservative forces do work; then the change in mechanical energy equals the
Card 8
Question: How is work defined in terms of energy transfer?
Answer: Work W is the energy transferred to or from an object by means of a force acting on the object. Positive work transfers energy to the object; negative
Card 9
Question: Explain the relation between work and changes in kinetic energy.
Answer: If you accelerate an object by applying a force (doing positive work), you increase its kinetic energy; if you decelerate it (negative work), you decr
Card 10
Question: Give the formula for work done by a constant force and explain the terms.
Answer: W = F d cosθ, where F is the magnitude of the constant force, d is the magnitude of displacement, and θ is the angle between the force and the displac