Newton's second law of motion / cross-body backpack

https://1.bp.blogspot.com/-hNObLPA0eS8/XTCZyPzykNI/AAAAAAAARKg/LUurHgtIsGUSHWkB5TQZ3y7vsA5Q_lqnwCK4BGAYYCw/s640/DSC01701.jpg Newton's second law of motion Before the boss started painting I have studied Physics, but the results are too bad. Decided to take a break from school and change the department of drawing So later came the buckskin According to what I have learned before, Newton’s second law of motion is: The external force received by the object is equal to the product of the mass of the object and the acceleration. This is the boss who has read the physics department, can tell the most difficult science XD Very inferior Bag size: width 30cm x height 24cm x bottom thickness 4cm The strap is adjustable, the shortest 68cm / the longest 135cm The body of the backpack is made of cotton and the strap is made of man-made fiber. https://4.bp.blogspot.com/-bzncEZ1xIIo/XTHSZbBbUmI/AAAAAAAARLs/vMF6nX3H9uI6IIFxksyTrYaiF_vmRMHogCK4BGAYYCw/s640/DSC01688.jpg We chose striped fabrics that are very similar to notebooks. Fine mathematical formula embroidered on it Just like the feeling of our usual essay painting~ https://3.bp.blogspot.com/-TaRYyhAN1oA/XTHSZCOjDNI/AAAAAAAARLk/ZZA6YFd49jsUcTfPntHgBLSxQht-ffPewCK4BGAYYCw/s640/DSC01687.jpg The bag mouth is fixed with a rotary lock to prevent the contents of the bag from running out. https://4.bp.blogspot.com/-mPpwMTRKpV0/XTHSY-1VjoI/AAAAAAAARLU/JYAwmN2g-iQXXnZFW6kETl6btwDPb26UwCK4BGAYYCw/s640/DSC01686.jpg https://2.bp.blogspot.com/-OoVbfQ_zvis/XTHSZLQmZZI/AAAAAAAARLo/QlZlOcksFt4omT3wrmjqgKt4ulKq8jzjgCK4BGAYYCw/s640/DSC01684.jpg https://4.bp.blogspot.com/-yNoXtX_sdMg/XTHSPTcXSFI/AAAAAAAARLM/P5Tc1Wuem_8rx26FIr4WFTlemKL3JrkqwCK4BGAYYCw/s640/DSC01703.jpg https://2.bp.blogspot.com/-C4sFoIjDiY8/XTHSNFuaW2I/AAAAAAAARLE/XnvmWtNU9CwFXY39R5WwXJ0Ap3Gg-Sd3ACK4BGAYYCw/s640/DSC01700-2.jpg https://1.bp.blogspot.com/-QlVfyzYzqRk/XTHSLI5hfzI/AAAAAAAARK8/Ga_72HwZhJYgzWZVkeatt42EiYGSY8wpQCK4BGAYYCw/s640/DSC01705.jpg https://2.bp.blogspot.com/-3GmClnn7FgQ/XTHTQ8UP7AI/AAAAAAAARMM/Aoy3uUEeQ7EYJvjPbAZlSZiuY6csqgCLgCK4BGAYYCw/s640/DSC01683.jpg https://4.bp.blogspot.com/-NxqbqMknsCo/XTHTQMfU2WI/AAAAAAAARME/9CL__ew1hMYR1j8Jg-6WJ7xsDGb5HZVGgCK4BGAYYCw/s640/DSC01682.jpg https://3.bp.blogspot.com/-3-qwNYKa_sA/XTHTfJinj5I/AAAAAAAARMU/AbUUStVBUGkSxt8WQyRhm7TkUhpi7pvkQCK4BGAYYCw/s640/DSC01689.jpg There is a small bag on the inner layer that can hold things like keys that are hard to find! The size of the backpack is: 30 x 24 cm / bottom thickness 4 cm The length of the strap can be adjusted The body of the backpack is made of cotton and the strap is made of man-made fiber. https://2.bp.blogspot.com/-CZUfzIQlz8U/XTCVkYICX_I/AAAAAAAARJA/01QFGaVUC_Ar29xmLUeeAVUHQFAcQaCGgCK4BGAYYCw/s640/DSC01681.jpg https://2.bp.blogspot.com/-wswbwBg_K6s/XTCVkzTYbiI/AAAAAAAARJo/hTE-dIEMkagn6etZeOJ8aJT21ZUp3IeCACK4BGAYYCw/s640/DSC01680.jpg https://3.bp.blogspot.com/-HKpM_u3dPio/XTCVkfALIeI/AAAAAAAARJU/XgFc18MSkmsLSG5s5MpCZu8C-818lZLKgCK4BGAYYCw/s640/DSC01678.jpg https://4.bp.blogspot.com/-36VmAqL6JYs/XTCVhXJY3nI/AAAAAAAARIU/uQv6irjAoM8tzAqI72vBvfcBLV_nFCI_gCK4BGAYYCw/s640/DSC01677.jpg https://1.bp.blogspot.com/-ZIkA6phcErk/XTCVg4iLFYI/AAAAAAAARIM/4WBHnq9srgEsWE_-1MUub01Ro7z9fH4ewCK4BGAYYCw/s640/DSC01675.jpg https://1.bp.blogspot.com/-YwsoxpDDYh4/XTCVXWEZ4WI/AAAAAAAARHk/Pfex1vSu7NsrvqqrbtGJAwQhaQLDGncqACK4BGAYYCw/s640/DSC01674.jpg https://1.bp.blogspot.com/-KP3Khw95MZM/XTCVlo7gGzI/AAAAAAAARJ4/ai0lvo4VlVwcxEPkpXQow9Zg5HYtVNe7QCK4BGAYYCw/s640/DSC01672.jpg https://1.bp.blogspot.com/-oYT8sJJ0QiY/XTCVk5PXIWI/AAAAAAAARJw/vIjm3tJtdrkzcZtR7WgW4Ou9BevdRmM1ACK4BGAYYCw/s640/DSC01671.jpg https://3.bp.blogspot.com/-EwW9XKpjkc8/XTCVllwmUUI/AAAAAAAARJ0/N5T8IyHR8Eg5sylbxfjTPCPAc4FyYuH_QCK4BGAYYCw/s640/DSC01668.jpg https://3.bp.blogspot.com/-p0X7XTdjyJI/XTCVfvQKj3I/AAAAAAAARH8/fzEVaNwiYjEoBGE03lKZ1IdeVx0Mu_LFQCK4BGAYYCw/s640/DSC01667.jpg https://2.bp.blogspot.com/-3NSGJ6ru0Jc/XTCVkXVqtNI/AAAAAAAARJc/4dPvTlfX1L0Z8mhjcCCGP1nGomdACCPDACK4BGAYYCw/s640/DSC01666.jpg https://1.bp.blogspot.com/-kgNlIwhBHGQ/XTCVfhaAR5I/AAAAAAAARH4/EIrKFvUNrA8XvsendrdCYHY14psAecCdACK4BGAYYCw/s640/DSC01665.jpg https://3.bp.blogspot.com/-aA8LDml773w/XTCVPh6G-iI/AAAAAAAARHM/vflvChjsU80MFHiE72QU_eOZSer6h2N7ACK4BGAYYCw/s640/DSC01664.jpg https://3.bp.blogspot.com/-nrckZ5DiTdQ/XTCVkiHKzfI/AAAAAAAARJk/BSGyi3dxf4Y5asbWUJqkr5yqTKMnmNO-wCK4BGAYYCw/s640/DSC01663.jpg https://1.bp.blogspot.com/-AteyDtbWUzQ/XTCVfEGeeyI/AAAAAAAARHs/f6MTi1rCnkoYVROm2HRES___TviX9oTmwCK4BGAYYCw/s640/DSC01662.jpg https://3.bp.blogspot.com/-c1PUeHSjems/XTCVTl2q81I/AAAAAAAARHc/9lwIgpGeCOQp07aFydEnSFvrycKzCBkqQCK4BGAYYCw/s640/DSC01661.jpg https://1.bp.blogspot.com/-dhny01ya8OU/XTCVjsIMlaI/AAAAAAAARIw/dGQoz4xd8CU4U4T3AaxsTVL2nUrVkmZowCK4BGAYYCw/s640/DSC01660.jpg https://4.bp.blogspot.com/-c_OO9Bd7Dgo/XTCVkc18S_I/AAAAAAAARJM/CZJ9RKyp3lIFRdOrbK-AjYplOqxVzLnEACK4BGAYYCw/s640/DSC01659.jpg https://1.bp.blogspot.com/-LWizPxGnYH4/XTCVjAmOToI/AAAAAAAARIk/ZliZrYy7YpEHsFRdthBlPgW8TAboqQXkQCK4BGAYYCw/s640/DSC01658.jpg https://3.bp.blogspot.com/-PPaVpWNaO-A/XTCVSlqmlOI/AAAAAAAARHU/7EOipiNYeZUEZpBLxzRgdsL7838TtAqEACK4BGAYYCw/s640/DSC01657.jpg https://3.bp.blogspot.com/-77CZkXt_YeE/XTCVg-IhC1I/AAAAAAAARII/hAnkWP8egvcVsjJcVbwgiCrxOmUmiFDPwCK4BGAYYCw/s640/DSC01655.jpg https://3.bp.blogspot.com/-eR-oLv_eUc4/XTCVjOng4YI/AAAAAAAARIo/TVHngc4miA8HltkAIKQXL6nUVBy6dnqjwCK4BGAYYCw/s640/DSC01654.jpg