Tagged With "conservation of momentum"

Blog Post

A Momentum Conservation Experiment for an Inelastic Collision Between Two Carts

Rich ·
Do you have two PocketLab Maker Kit carts, and do you have the free VelocityLab app? Then you are all set to do some experiments in conservation of momentum with PocketLab! This lab discusses how to setup and perform an inelastic collision in which one cart (A) is moving toward another cart (B) that is at rest. When cart A hits cart B, they stick and move off together. The photo below shows the two carts shortly before the collision would occur. PocketLab is mounted on a front wheel of cart...
Blog Post

A Classic Conservation of Momentum Experiment with PocketLab

Rich ·
A well-known conservation of momentum experiment that has been around for many years involves dropping a brick onto a horizontally moving cart. With PocketLab and the VelocityLab app, your students can perform this experiment easily with the cart from the PocketLab Maker Kit and a small block of wood. The snapshot below shows the setup with the author about to drop the block of wood onto the cart coming from the left. A pair of rails, with inside separation just a little larger than the axle...
Blog Post

Conservation of Momentum When Two Carts "Explode"

Rich ·
Do you have two carts from the PocketLab Maker Kits? Do you have two PocketLabs? You probably have at least two students in your physics class with iPhones. Do they have the VelocityLap app installed on their iPhones? Then you have the major components for your students to investigate conservation of momentum when two carts on a track "explode". As shown in the picture below, each cart has a PocketLab mounted on one of its wheels, so that the z-axis is the axis of interest when the carts are...
Blog Post

Rotational Dynamics of a Falling Meter Stick

Rich ·
There is a well-known problem in rotational dynamics that involves a meter stick. The meter stick is held in a vertical position with one end on the floor. It is then released so that it falls to the floor. The end initially on the floor is not allowed to slip during the fall. Students are asked to derive an equation that predicts the angular velocity of the meter stick just before it hits the floor. The derivation involves many physics concepts including gravitational potential energy,...
Blog Post

Using VelocityLab in an AP/College Physics Experiment Involving Rotational Dynamics

Rich ·
This experiment is designed for AP Physics and college physics students. It considers a solid cylinder of mass M and radius R that is rolling down an incline with a height h without slipping. Using energy and dynamics concepts, students first derive equations for (1) the speed of the center of mass of the cylinder upon reaching the bottom of the incline, and (2) the acceleration of the center of mass of the cylinder as it rolls down the incline. The free-body diagram at the center shows all...
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