Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
work and energy
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10. • Man does positive work
lifting box
• Man does negative work
lowering box
• Gravity does positive work
when box lowers
• Gravity does negative work
when box is raised
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18. • Power is rate of energy transfer
P
•
W
t
SI units are Watts (W)
m2
1 W 1 J / s 1 kg 3
s
•
US Customary units are hp (horse power)
1 hp
550 ft lb/s
746 W