A child is pulling a wagon across the grass but friction between the grass and wheel creates a force in the opposite direction. If the wagon is speeding up, what does that mean about the two forces?

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.

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