Two carts on a low friction air-track are connected by an unstretched spring.   Cart 1 has an inertia of 1.5 kg while cart 2 has an inertia of 2.5 kg.   The spring has a spring constant of 10 N/m and negligible inertia.   You push cart 1 in the direction of the cart 2 with a constant force of 5.0 N.   (a) What is the acceleration of the centre of mass of the cart-spring system?          (b) What is the acceleration of each cart the instant you begin to push?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.