Lesson: The Conservation of Angular Momentum Physics • 9th Grade
In this lesson, we will learn how to calculate the kinematic properties of an object where the angular momentum of the object is conserved.
Sample Question Videos
Three disks can all rotate around an axle. The disks have moments of inertia , , and , where and , and angular velocities , , and . If increases by 0.5 rad/s, by how much must and change in order to counterbalance the increase in the angular momentum of the other disk? Assume that and change by the same amount.
Two asteroids orbiting a star collide and form a single, larger asteroid. The first of the two initial asteroids has an angular momentum of kg⋅m2/s. The second of the two initial asteroids has an angular momentum of kg⋅m2/s. What is the angular momentum of the larger asteroid that they form?
A satellite with a mass of 1,200 kg orbits Earth. The satellite follows an elliptical orbit, so the radial distance of the satellite from the center of Earth changes as it orbits. The angular momentum of the satellite is conserved throughout its orbit.
When the satellite is at a radial distance of 7,900 km from the center of Earth, it moves at a speed of 2.2 km/s . What is the angular momentum of the satellite at this point in its orbit? Give your answer in scientific notation to two decimal places.
What will the speed of the satellite be when it is at a radial distance of 8,500 km from the center of Earth? Give your answer in scientific notation to two decimal places.