Physics Exercise: Net Force Calculation - Prof. Kevin Lee, Study notes of Physics

Download Physics Exercise: Net Force Calculation - Prof. Kevin Lee and more Study notes Physics in PDF only on Docsity! T mg Physics 151 Class Exercise: Net Force In the sequence of images that follow, Bob Costas is shown riding on an elevator while standing on a scale that illustrates his apparent weight. In the image to the immediate right, Bob is shown standing in the elevator stopped at the 6th floor. Determine the acceleration of the elevator in each of the four images. (Hint: You should begin by drawing a FBD and specifying your coordinate system.) a1 = 0 m/s2 2 700 71.4 9.81 W mg W Ng kg mg s = = = = ⎛ ⎞ ⎜ ⎟ ⎝ ⎠ ( ) ( ) ( )2 2 1000 700 4.2 71.4 yF N mg ma N NN mg ma m kg s Σ = − = −− = = = ( ) ( ) ( )3 2 400 700 4.2 71.4 yF N mg ma N NN mg ma m kg s Σ = − = −− = = = − ( ) ( ) ( )4 2 0 700 9.8 71.4 yF N mg ma N NN mg ma m kg s Σ = − = −− = = = −