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Old Jul 16th 2018, 06:32 AM   #1
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check my answer

A man ran up the road. Air resistance is negligible. We have before us a proposal to draw up forces. The forces that operate on the man according to the chart are:
mg weight;
N strength of the clamp;
* f friction force;
* D power of the man.
How many errors are there in the proposal?
check my answer-dddd.jpg
Choose one answer:
0
1
2
3
More than 3


I think there is only one error of weight.
What do you think
?
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Old Jul 16th 2018, 07:11 AM   #2
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This is a more subtle question than it first appears,
and requires some careful thought.

There are two "primary" forces shown, and two "reaction" forces.
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Old Jul 16th 2018, 07:14 AM   #3
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Originally Posted by Woody View Post
This is a more subtle question than it first appears,
and requires some careful thought.

There are two "primary" forces shown, and two "reaction" forces.
what did you think about the answer??
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Old Jul 16th 2018, 08:28 AM   #4
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Errors imply measurements.

The upward force must equal the downward force,
to stop the man either flying or falling through the floor.

Similarly the friction force must equal the pushing force,
(unless he is slipping at each step).

The mass of the man will have to be measured,
as will the power with which he is pushing his body forward.
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Old Jul 16th 2018, 10:59 AM   #5
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I think there is only one error of weight.
What do you think
?
I think you are just guessing.

Work through each of the proposed forces systematically and state whether you think they are correctly displayed or not and state why.

Hint: one is correct; three are incorrect.
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Last edited by studiot; Jul 16th 2018 at 01:40 PM.
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