F sin 0 F F m2 F cos 0 M2 m1 mig m2g m1 b a Figure 5.21 (Example 5.13) (a) The external force F applied as shown can cause the block to accelerate to the right. (b, c) Diagrams showing the forces on the two objects, assuming the block acceler- ates to the right and the ball accelerates upward.

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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.