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Explore the concept of power in physics through an example of two weightlifters, one who lifts faster than the other, to see that power measures the rate at which work is done. Finally, learn how to calculate both average and instantaneous power.
Review the key concepts and equations for power, including the difference between power and energy.
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Lesson 1: Work and energy. What are energy and work? What is kinetic energy? What is gravitational potential energy? What is conservation of energy? Work and the work-energy principle.
Middle school physics; High school biology. NEW. High school chemistry. NEW. High school physics. NEW. Hands-on science activities. NEW. AP®︎/College Biology; AP®︎/College Chemistry; AP®︎/College Environmental Science; AP®︎/College Physics 1; See all Science; Computing; Intro to CS - Python. NEW.
Review the concepts and formulas of current, resistance, and resistivity in DC circuits with Khan Academy's interactive exercises and videos.
Newton's first law of motion introduction. Applying Newton's first law of motion. Newton's second law of motion. More on Newton's second law. Newton's second law review. Understand: force, mass, and acceleration. Apply: force, mass, and acceleration.
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Watch this video to learn the basic concepts of work and energy, and how they are related to force and displacement.