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[Phy] 20 Common Misconceptions about Force and Motion

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20 Common Misconceptions about Force and Motion

想test下自己mechanics仲有冇錯concept? 試下呢個True or false quiz la!
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Q14 has been updated to clarify what I actually want to ask. Thanks for yeungwk91's input.

[ 本帖最後由 antonyluk 於 2016-1-31 09:48 PM 編輯 ]
   

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Q14)
When you are walking forward, the direction of the friction from the ground acting on you is also pointing forward.

Your answer is True.
However,

If a man is walking forward with constant velocity, the net friction is zero ( If you dont count air resistance).

If a man is decelerating, the friction on him should be backwards.

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thx  a lott

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Thanks

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回覆 2# yeungwk91 的帖子

phy神

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:) :) :)

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dddddddddddddddddddddddddddd

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20 / 20

[ 本帖最後由 byronwan 於 2016-1-31 10:29 PM 編輯 ]

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thanks

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thank you for shairng

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