physics moments question

i am having a terrible time with moments and don't seem to be getting many questions right, and I'm not sure what I'm doing wrong. here's some of the questions (questions 6 and 8)
https://downloads.umutech.net/Physics/AS/Old_Content/MultipleChoiceMatMech.pdf
for 8 I keep getting 103N. it's so frustrating! :frown:

if anyone could help with any of these, I'd be super grateful.

(edited 1 year ago)

Original post by pauline222

i am having a terrible time with moments and don't seem to be getting many questions right, and I'm not sure what I'm doing wrong. here's some of the questions (questions 6 and 8)
https://downloads.umutech.net/Physics/AS/Old_Content/MultipleChoiceMatMech.pdf
for 8 I keep getting 103N. it's so frustrating! :frown:

if anyone could help with any of these, I'd be super grateful.

It is better that shows us what you have done, so that you can advise you further.

Original post by pauline222

i am having a terrible time with moments and don't seem to be getting many questions right, and I'm not sure what I'm doing wrong. here's some of the questions (questions 6 and 8)
https://downloads.umutech.net/Physics/AS/Old_Content/MultipleChoiceMatMech.pdf
for 8 I keep getting 103N. it's so frustrating! :frown:

if anyone could help with any of these, I'd be super grateful.

For these types of questions, we would apply the following concepts:
When an object is in static equilibrium, the following two conditions are satisfied:
1. The resultant force on the object is zero.
2. The resultant moment on the object is zero.

For Q6

We can apply the principle of moments about the point where the frictional force and N₁ act to find N₂.
Since the resultant force is zero, N₂ is equal to F.

physics moments question

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