Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 6th Edition
Work and Energy
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6-1: Work, Constant Force
6-3: Kinetic Energy; Work-Energy Principle
6-4 and 6-5: Potential Energy
6-6 and 6-7: Conservatino of Mechanical Energy
6-8 and 6-9: Law of Conservation of Energy
6-10: Power

Problem 8
a) Fa=3.8×102NF_a = 3.8 \times 10^2 N
b) Wa=1.4×103JW_a = -1.4 \times 10^3 J
c) Wfr=4.1×103JW_{fr}=-4.1 \times 10^3 J
d) Wg=5.5×103JW_g=5.5 \times 10^3J
e) Wnet=0W_{net}=0
By sweetlikesonia on Sat, 10/20/2012 - 10:29 PM

Hi, I keep getting messed up on the direction of the horizontal forces in incline problems.... Can you please throughly explain why you made both the friction force and the applied force going up the incline?

By mikepeter on Sun, 4/24/2016 - 9:53 PM

if you consider figure, just assume that applied force is not given, piano will slide towards the man. so friction force is opposite to the moving direction of piano

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