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Conservation of Energy

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More Lessons for High School Physics

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A series of free Online High School Physics Video Lessons.

In this lesson, we will learn

  • the law of conservation of energy
  • momentum
  • impulse

Conservation of Energy

Using the law of conservation of energy to see how potential energy is converted into kinetic energy.A brief overview of the law of conservation of energy and how to apply conservation of energy to analyze energy transitions and transformations in a system.


Momentum is a vector quantity used to quantify an object's motion in which the direction of the vector is the same as the direction of the object and the magnitude is equal to the mass times the velocity. According to the law of conservation of momentum, in collisions between multiple objects, the total momentum of the system remains unchanged. The formula for momentum is momentum = mass × velocity.

What momentum is. A simple problem involving momentum

Understanding an object's momentum.
An example of conservation of momentum in two dimensions.


Impulse measures the change in the momentum of an object. Impulse is expressed as the integral of force over time and its unit is the Newton-second (N × s). Expressed without Calculus, impulse = force × time.
A brief overview of the impulse-momentum theorem and selected applications for beginning physics students in algebra-based physics courses.
Derive the impulse-momentum theorem
Use impulse to solve a variety of problems
Interpret and use Force vs. Time graphs
A 90 mph fast ball is hit for a home run. See how to apply impulse and momentum equations to baseball.

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
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