Two people are pushing a truck across a parking lot. The truck has a mass of about 2 × 10 kg. First, they take turns pushing. When Person A pushes the truck, the truck accelerates at a rate of 1 m/s?. When Person B pushes the truck, it accelerates at a rate of 2 m/s? (a) Both people stand behind the truck and push in the same direction. What is the net force on the truck? At what rate will the truck accelerate? (b) Person A stands at the back of the truck and Person B stands at the front, and they push in opposite directions. What is the net force on the truck? At what rate will the truck accelerate? In what direction? For both (a) and (b), draw a picture indicating the forces applied by A and B as well as the motion of the truck.

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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.