A teenager of mass m1 = 61 kg pushes backward against the ground with his foot as he rides his skateboard. This exerts a horizontal force of magnitude Ffoot = 10.5 N. The skateboard has m2 = 2.7 kg. Variables Ffoot = 10.5 N m1 = 61 kg m2 = 2.7 kg a)Write an expression for the magnitude of the horizontal component of force that the ground exerts on the teenager's foot, Fground. Fground= b) Write an expression in terms of given quantities for the magnitude of the skateboard's acceleration, a, while the teenager is pushing backwards on the ground.

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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.