Physics — Free-body: block on an accelerating cart
Friction accelerates the block with the cart.
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title "Block on an accelerating cart"
surface "Cart floor"
body B at 360,260 size 110,110 label "block"
force W on B vector 0,150 color red label "mg"
force N on B vector 0,-150 color blue label "N"
force f on B vector 130,0 color green label "friction (accelerates block)"