Warmup Dec 3 Show how to convert from pounds (lb) to Newtons (N). What is the single number you end up multiplying by to get from lb to N in one step?

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Presentation transcript:

Warmup Dec 3 Show how to convert from pounds (lb) to Newtons (N). What is the single number you end up multiplying by to get from lb to N in one step?

Warmup: Dec 5 Many mountain roads are built so that they zigzag up the mountain rather than go straight up toward the peak. Discuss the advantages of such a design from the viewpoint of energy conservation and power. Recall our definition of power: Power = Work/time

Work and Power Work – Energy Transfer Equation for work: W = F d Units of work: Joules (J) Power – Rate of Energy Transfer Equation for power: P = W/t Units of power: Watts (W) Power/746 W = hp

Warmup: Dec 6 Write the equation for momentum and kinetic energy: p = mv and KE = (1/2)*mv2 If an object is not moving, what is its momentum? If a particle’s kinetic energy is zero, what is its momentum? If two particles have equal kinetic energies, do they have the same momentum? Explain.

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