Normal Force Physics Problems With Tension, Inclined Planes & Free Body Diagrams

This physics video explains how to calculate the normal force on a horizontal surface when a downward force is applied or when an upward tension force is used to lift the block. This is useful for solving common physics problems associated with forces and free body diagrams.
Forces - Free Formula Sheet:
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Physics 1 Final Exam Review:
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Physics PDF Worksheets:
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Newton's 1st Law of Motion:
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Newton's 2nd Law of Motion:
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Newton's 3rd Law of Motion:
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Mass Vs Weight:
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Free Body Diagrams:
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Normal Force Problems:
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Elevator Physics Problem:
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Net Force Physics Problems:
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What Is a Normal Force?
• Physics - What Is a No...
Static Friction and Kinetic Friction:
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Physics Forces Review:
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Centripetal Acceleration:
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[@TheOrganicChemistryTutor]

Forces - Free Formula Sheet: bit.ly/4duMv3W
Physics PDF Worksheets: www.video-tutor.net/physics.html

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[@mharakarmnx8526]

If the box is on a horizontal surface and there is no other force than gravity the normal force will equal the weight
2-if there was pressure on the box the normal force will increase normal force=weight+the pressure
3- if there was a rope pulling the box the normal force will decrease normal force =weight-the tension force

[@yeahyeah9639]

I have a question on 16:23 . Can we use the equation Fn= -W + Ty instead because since the weight force is acting downwards then I see it better as negative. Or should I just use that one. Please answer this has been a question of mine but I can’t seem to find a solid answer

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[@camillahalvares1406]

thanks

[@furkankaraman6245]

Why do we choose fy is zero in this video and before, I couldnt catch it

[@carloskruut423]

At 16:21, shouldn't the net force be equal to about 34 N because 294 - 259 = 34? You're videos are carrying me through uni physics!

[@blackdoghd3149]

@carloskruut423 Ty is equal to 150, not 259, so 144N is correct
if it was 259, it would be 35 tho

[@carloskruut423]

@@blackdoghd3149 Ah okay I see the mistake I made, thanks!

[@antonybigwizard6630]

Bravo!

[@f.o.v.y3667]

Wow wondering explained

[@muhammadnoornaveed9994]

1:30 if normal force is equal to force of gravity so body should float in air ? as upward and downward forces are equal.PLEASE EXPLAIN!!

[@bittersweetrain1740]

See 11:52
Okay. So the normal force pushes up and gravity pushes down. So nothing happens since they are equal. Yay!
Normal force only apples when it is touching the ground. But since it is not touching the surface no more, there is no normal force.
Assume it is still on the ground now.
Now in the gravitational force was bigger than the normal force.... we get squished flatter than flat Stanley :(

[@araash178]

Great video! One question: At around 3:42, what do you mean by "lift up?" If you lifted the block up, then it wouldn't be in contact with another object. This would mean that there would be no normal force then. Can you/someone explain please? Cheers!

[@mahmoudnassar3135]

You dont actually lift it up u just apply some pulling force using the robe hence decreasing the load of the box on the table without lifting it ... Try to imagine it

[@madboycal7859]

@@mahmoudnassar3135 rope*

[@moonyartist]

It simply don't apply the necessary force to lift the block up, it just decreases the weight that the block is applying to the surface. Hope you understood!
P.D: I don't know why I'm explaining it, you have already received an answer two years ago (I didn't realize until I revised my grammar🤣).

[@Leventk903]

@@moonyartist nah its helpful :)

[@rest_in_prince_I_h_trains]

Talking about the normal force at 12:23 , what would happen if the normal force would equal to 0 N?

[@jenniferteixeira4874]

then it wouldn't be in contact with any surface

[@prakharsingh1683]

But it wouldn't be lifted up it would dangle in mid air

[@pranavgurung2539]

How go we calculate the normal reaction if it is being pushed down at a certain inclined angle?

[@jenromeave4793]

the normal force, you mean? by getting the component in the y-direction- it’s one of the weight components. i highly suggest you search it up.

[@lhavaneshkunalan184]

if it involves an angle, then most likely you should be resolving it into vertical and horizontal components. For instance, if there's block on an inclined plane which is displaced as 30 degree from the horizontal , then the normal force will be weight cos 30. and in order to determine the force that is parallel to the inclined plane, then it would be weight sin 30.

[@michelemyriammoukamfoleu2886]

If the body is not placed directly on the ground but on 2 skids at different points with significant distances.

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2 years later maybe they did
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[@fyzalei]

at 15 mins, why is sum of fy is zero when fy is mg not ma.

[@seankylemaitim8367]

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[@3B-OD]

Can someone explain why at 17:38 we use cos ?

[@yeahyeah9639]

For Angeled planes it’s the opposite. Instead of using cos to find X value, you use sin. So just think of it as the opposite 😊 im sure u can find some explanations on why but the basis is that it’s opposite for an inclinded plane

[@3B-OD]

@@yeahyeah9639 I actually found an explanation, Thanks 😊

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