What makes you say that? by Jimmy Lin https://padlet.com/j1mmylin/1tu4y2an7ghi en-us 2018-10-23 03:47:00 UTC 2019-01-17 03:00:44 UTC hello@padlet.com Jimmy j1mmylin https://padlet.com/j1mmylin/1tu4y2an7ghi/wish/295775781 There is frictional force. ]]> 2018-10-23 03:50:26 UTC https://padlet.com/j1mmylin/1tu4y2an7ghi/wish/295775781 Energy j1mmylin https://padlet.com/j1mmylin/1tu4y2an7ghi/wish/295775882 Energy

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Frictional force opposes motion]]> 2019-01-17 03:00:35 UTC https://padlet.com/j1mmylin/1tu4y2an7ghi/wish/321528275