Insights into Student Use
• Whenever there is a net force, the cart on the Net Force screen will accelerate. If more pullers are
added after the motion is started, students may have to run some tests to understand that the
motion was already happening. This might be a great teaching moment around “An object at rest
stays at rest and an object in motion stays in motion unless acted upon by an external force.”
• Students may have some difficulty understanding why adding mass in the frictionless
environment doesn’t change the motion.