Need help in some concept questions

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Homework Help Overview

The discussion revolves around identifying various physics concepts related to motion and forces, such as friction, impulse, momentum, and the laws of motion, based on specific scenarios. Participants are attempting to match these concepts to given physical situations, seeking validation for their answers.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants share their attempts at matching concepts to scenarios, with some expressing uncertainty about specific terms like "kick force." Others question the appropriateness of certain concepts for specific situations, such as whether serving a volleyball should be classified under impulse.

Discussion Status

The discussion is ongoing, with participants revising their answers based on feedback and questioning the reasoning behind their choices. Some guidance has been offered regarding the application of laws of motion in specific contexts, but no consensus has been reached on all answers.

Contextual Notes

Participants are working within the constraints of a homework assignment that requires identification of concepts without providing complete solutions. There is a focus on understanding the definitions and applications of various physics concepts.

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Homework Statement


A. Friction
B. Impulse
C. Momentum
D. 3rd Law of Motion
E. 2nd Law of Motion
F. 1st Law of Motion
G. Circular Motion
H. Freely Falling
I. Projectile

Homework Equations


Write the letter of the concept/theory under the following physical situation.

1. Truck and car moving with the same speed approaching each other.
2. Sliding a box of books across the library floor.
3. Launching of space shuttle causing rocket propulsion.
4. Pulling up a string attached to a cliff.
5. Contact of soles of shoes and the floor.
6. An LED television set stands on a table.
7. A kick force of a player in a football match.
8. Ripe date fruits falling from the tree.
9. Serving the volleyball in a match.
10. Using the lift (elevator) in going to the different floors of the building.These are just a simple of identification and concept question but I want to be sure of my answer can anyone help? thanks.
 
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What is your attempt
 
This is my attempt:

1. C
2. A
3. D
4. E
5. A
6. F
7. B
8. H
9. I
10. D
 
Last edited:
so0lid said:
3. B - I guess its C+D
7. B isnt it projectile motion ??
10. D How? I guess its E

Rest i think is fine
 
Yeah I changed 3. to D ..
and 7. it could be projectile but what does "kick force[/color]" word mean here.
And 10. look you are correct.

What do you think?!
Thank you for reply. Hope to see any other sure answer.

Edit: I guess 10. is D because when solving question for elevators -especially when moving up or down. we use ∑F = ma. Also the elevator have increasing/decreasing up/down accelerator and not constant, so if we say a mass of a man inside the elevator when going up will push with force the elevator down. In this situation we are using the 3rd Law of motion.
 
Last edited:
so0lid said:
and 7. it could be projectile but what does "kick force[/color]" word mean here

Many others could also have other answers

but i am guessing the answer is the concept which explains majority of concept ... you might be right ...

9. Serving the volleyball in a match.

why not impulse for this ?
 
I edit my last post check please.

and 9. i guess I took it as majority of concept :p
 
so0lid said:
Edit: I guess 10. is D because when solving question for elevators -especially when moving up or down. we use ∑F = ma. Also the elevator have increasing/decreasing up/down accelerator and not constant, so if we say a mass of a man inside the elevator when going up will push with force the elevator down. In this situation we are using the 3rd Law of motion.

∑F = ma is second law
third law is the action reaction pair
 
Aha, thanks anyway. :)